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When I ask my students to describe a difficult financial situation, they almost never say “I’m struggling to stay solvent.” Instead, they reach for an idiom: “I’m keeping my head above water.” These metaphorical phrases stick in memory far better than abstract definitions, and English is full of them — particularly the ones inspired by water, the sea, and the ocean. Today I want to share the 13 idioms from this category that show up most often in conversation, writing, and exams.
What makes water idioms so memorable is that they paint vivid mental pictures. When you say something is “water under the bridge,” everyone instantly sees water flowing past, carrying the past away. That visual quality is what we’ll explore here — the literal image behind each idiom, plus real-world examples you can use in work, casual chat, and formal settings.
Key Takeaways
- Water idioms describe struggle, survival, and money — “keep your head above water” (survive), “spend money like water” (waste), and “in hot water” (in trouble).
- Sea/ocean idioms are about opportunity and scale — “plenty of fish in the sea” (many chances), “a drop in the ocean” (insignificant), “the world is your oyster” (unlimited potential).
- Literal meaning always supports idiom meaning — a fish dies out of water, so “like a fish out of water” means uncomfortable; water flows under bridges, so “water under the bridge” means past and forgiven.
- Register varies — “in hot water” and “blood is thicker than water” are neutral-to-formal; “spend money like water” is informal.
- Not all examples are equally common — “of the first water” is rare and literary; “keep your head above water” is everyday speech.
Water Idioms
1. Water Under the Bridge
Literal meaning: Water that has already flowed past a bridge and cannot return.
Idiom meaning: Something that happened in the past that cannot be undone, but is forgiven or accepted and no longer bothers you.
Register: Neutral to informal. Used in both personal and professional contexts.
Example 1: That argument we had is just water under the bridge now — don’t even worry about it.
Example 2: I know you were late to the last three meetings, but let’s consider that water under the bridge and start fresh.
Example 3: They used to be competitors, but those disputes are water under the bridge; now they work together without tension.
Common confusion: “Water under the bridge” is not used to mean something still happening or still relevant. If a problem is ongoing, you would say “that’s still a sore point” or “that hasn’t been resolved.”
2. Keep (One’s) Head Above Water
Literal meaning: To hold your head up while swimming or drowning, to stay afloat.
Idiom meaning: To try very hard to survive financially, manage overwhelming work, or handle a difficult situation without being defeated.
Register: Informal to neutral. Very common in conversations about jobs, finances, and stress.
Example 1: We all have to co-operate just to keep our heads above water during this economic downturn.
Example 2: As a single parent working two jobs, she’s barely keeping her head above water.
Example 3: I’m keeping my head above water at work, but just barely — this project is overwhelming.
3. In Hot Water
Literal meaning: Immersed in water that is heated to a painful or dangerous temperature.
Idiom meaning: In serious trouble because of something you did; facing punishment or negative consequences.
Register: Informal. Commonly used in casual conversation and storytelling.
Example 1: Rick’s temper had landed him in hot water again at the office.
Example 2: When the teacher discovered the exam answers were shared, all three students were in hot water.
Example 3: If you keep arriving late, you’ll be in hot water with your boss.
4. Like a Fish Out of Water
Literal meaning: A fish removed from water, gasping and struggling to survive.
Idiom meaning: To feel very uncomfortable or out of place because you are in an unfamiliar or unsuitable situation.
Register: Informal to neutral. Very common in everyday speech.
Example 1: When Carla transferred to a new school, she was like a fish out of water because she didn’t know anyone there.
Example 2: I’ve never been to an opera before — I felt like a fish out of water surrounded by all those formal people.
Example 3: He wore casual shorts to the black-tie event and looked like a fish out of water.
5. As a Duck Takes to Water
Literal meaning: A duck entering water naturally and immediately, as if it were made for water.
Idiom meaning: To do something easily, naturally, and without hesitation; to adapt quickly and happily to a new situation.
Register: Informal. Often used to describe people learning new skills or adjusting to new environments.
Example 1: My son is very social, so he took to kindergarten as a duck takes to water.
Example 2: She had never played tennis before, but she took to it like a duck takes to water — by the end of the summer she was winning matches.
Example 3: When we moved to Thailand, the children adapted as ducks take to water, despite the language barrier.
6. Blood is Thicker Than Water
Literal meaning: Blood (a substance) is physically thicker and more viscous than water.
Idiom meaning: Family relationships are stronger and more important than any other relationships or obligations; family loyalty comes first.
Register: Formal. Often appears in serious discussions about family duty and loyalty.
Example 1: My relatives insist that blood is thicker than water, but I can’t blindly condone the things some of them do.
Example 2: No matter what, blood is thicker than water — I’ll always support my brother, even when he’s wrong.
Example 3: The crime family operates on the principle that blood is thicker than water; you don’t betray family.
7. Spend Money Like Water
Literal meaning: To use water as freely and abundantly as one might pour water.
Idiom meaning: To spend too much money wastefully; to be extravagant or careless with money.
Register: Informal. Common in criticism or observation about someone’s spending habits.
Example 1: For years he was an absolute penny-pincher. Now that he’s got a steady job, he spends money like water.
Example 2: The lottery winners spent money like water and were broke within two years.
Example 3: She spends money like water on clothing even though her closet is already overflowing.
8. Of the First Water
Literal meaning: In gemology, “water” refers to the clarity and brilliance of a diamond. First water = the highest clarity grade.
Idiom meaning: Of the finest, highest, or most exceptional quality; without flaw or comparison.
Register: Formal and literary. Rarely used in modern English; mainly appears in older books or formal writing.
Example 1: The restaurant is renowned for serving food of the first water.
Example 2: His paintings are of the first water — museum curators competed to display his work.
Example 3: She’s a scholar of the first water in medieval history.
Rarity note: “Of the first water” is literary and old-fashioned. In modern English, you’re more likely to hear “top-tier,” “world-class,” or simply “excellent.”
9. (Not) Hold Water
Literal meaning: A container that does or does not have the ability to keep water inside (a leak makes it not hold water).
Idiom meaning: To be (or not be) true, believable, or able to be supported by facts or logic.
Register: Informal to neutral. Common in discussions of logic, arguments, and justifications.
Example 1: I’m afraid that excuse just doesn’t hold water with me — the numbers don’t add up.
Example 2: His theory doesn’t hold water because there’s no evidence to support it.
Example 3: The witness’s story holds water — the police confirmed every detail.
10. Water Something Down
Literal meaning: To add water to a liquid, reducing its concentration and strength.
Idiom meaning: To reduce the effectiveness, force, or impact of something (a law, message, idea); to weaken or dilute.
Register: Informal to neutral. Used in politics, business, and discussion of ideas and policies.
Example 1: The new laws watered down the power of the president.
Example 2: The original proposal was strong, but the committee watered it down so much that it lost all impact.
Example 3: Critics say the software update watered down user privacy protections.
Sea and Ocean Idioms
11. Plenty of (Other) Fish in the Sea
Literal meaning: The sea contains many, many fish — far too many to count.
Idiom meaning: Said to someone whose romantic relationship has ended; it means there are many other people in the world to meet, date, and potentially fall in love with.
Register: Informal. Comforting advice between friends, often when someone is heartbroken.
Example 1: Don’t cry over Pierre — there are plenty more fish in the sea!
Example 2: I know the breakup feels like the end of the world, but there are other fish in the sea waiting for you.
Example 3: After her divorce, her friends reminded her there were plenty of fish in the sea, and three years later she met someone wonderful.
12. A Drop in the Ocean
Literal meaning: One tiny drop of water in the vast, immeasurable ocean.
Idiom meaning: A very small amount or contribution compared to what is actually needed; something insignificant in the grand scale.
Register: Neutral to formal. Used in discussions of scale, resources, and impact.
Example 1: My letter of protest was just a drop in the ocean — thousands of letters arrived, but nothing changed.
Example 2: Donating 100 dollars to the charity is a drop in the ocean compared to the millions they need to build the hospital.
Example 3: One person’s carbon-reduction efforts are a drop in the ocean without global policy change.
13. The World is Somebody’s Oyster
Literal meaning: An oyster contains a pearl (historically believed to be treasure inside a shell), so “the world is your oyster” suggests the world contains unlimited value for you.
Idiom meaning: If the world is your oyster, you can do anything you want, go anywhere you want, and have unlimited opportunities ahead of you.
Register: Informal to semi-formal. Used as encouragement and motivation.
Example 1: You’re young and healthy and you have no commitments — the world is your oyster.
Example 2: With a law degree and family connections, she knew the world was her oyster.
Example 3: After winning the scholarship, the student felt like the world was his oyster.
Common Mistakes Learners Make
✗ Incorrect: Water under the bridge — I’m still upset about it.
✓ Correct: Water under the bridge — I’ve forgiven you and won’t bring it up again.
Why: “Water under the bridge” specifically means the past is resolved and forgiven. If something is still bothering you, the idiom doesn’t apply.
✗ Incorrect: He’s keeping his head above water, so he’s doing very well financially.
✓ Correct: He’s keeping his head above water, meaning he’s barely managing, but not thriving.
Why: “Keeping your head above water” implies struggle and effort, not success. It means survival, not prosperity.
✗ Incorrect: That excuse holds water in my book — I don’t believe it.
✓ Correct: That excuse doesn’t hold water — I don’t believe it.
Why: “Hold water” is usually negative or interrogative. Say “it doesn’t hold water” (false) or “does it hold water?” (is it true?)
Sample Dialogues
At a job interview
Interviewer: So tell me, how did you handle the last recession? Were you able to keep your head above water?
Candidate: It was challenging, but yes — I adapted my budget, took on freelance work, and managed to stay afloat.
Interviewer: That’s exactly what we’re looking for — resilience.
Between friends after a breakup
Maya: I can’t believe he broke up with me. I feel so alone.
Sofia: I know it hurts right now, but remember — there are plenty of fish in the sea. You’ll find someone better.
Maya: I hope so. It just doesn’t feel that way today.
Sofia: Give it time. The world is your oyster.
Quick Quiz
Fill in the blank with the correct water idiom:
- After the scandal, his explanation just didn’t __________ with the committee.
- Don’t worry — your past mistakes are __________. Let’s move forward.
- She spent her inheritance __________, buying expensive clothes and jewelry she never wears.
- When he joined the marketing team, he felt __________ because he had no experience in advertising.
- Your effort is good, but it’s just __________ compared to the scale of the problem.
Answers: 1. hold water · 2. water under the bridge · 3. like water · 4. like a fish out of water · 5. a drop in the ocean
Related Articles
- ↑ Master Pillar: English Speaking
- 200 Common English Idioms and Phrases with Meanings
- Food Idioms in English
- ↑ Back to pillar: English Idioms (Pillar)
Frequently Asked Questions
What does “water under the bridge” mean exactly?
“Water under the bridge” refers to events in the past that cannot be changed and have been forgiven or accepted. The image is of water flowing past a bridge and disappearing — once it’s gone, you can’t get it back. Use this phrase when something hurtful or problematic has been resolved and both parties have moved on.
Can “keep your head above water” mean doing well?
No. “Keeping your head above water” specifically implies struggle and effort to survive, not thriving or doing well. If you’re keeping your head above water, you’re managing a difficult situation — barely. It’s about surviving, not prospering.
Why do so many English idioms use water?
Water was historically crucial to survival and daily life, so it became a rich source of metaphor. People understood water’s danger (drowning, currents), its fluidity (things flowing away, disappearing), and its life-giving qualities. These concrete experiences made water idioms vivid and memorable for English speakers.
Is “of the first water” still used in modern English?
Rarely. It’s a literary, old-fashioned phrase that survives mainly in formal or historical writing. In modern conversation, you’d say “world-class,” “exceptional,” or “top-tier” instead. Learners don’t need to use it, but recognizing it in older texts is useful.
What’s the difference between “blood is thicker than water” and “family comes first”?
“Blood is thicker than water” is the traditional saying that emphasizes family loyalty above all else. Modern speakers often just say “family comes first” or “family is everything.” The idiom is more formal and carries the weight of an old saying, while the plain version is simpler and more contemporary.
Can you use “plenty of fish in the sea” for things other than romance?
Technically, yes — you could say “There are plenty of fish in the sea” about job opportunities or friendships — but the phrase is almost always used specifically for romantic relationships. For other contexts, just say “There are other options” or “You have many choices.”
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