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What Does “Sign In” Mean?

Phrasal verb formed from base verb sign.

Sign In
/saɪn ɪn/
phrasal verb A2

To enter your details to access an account you already have.

Definition of “Sign In”

To log into an existing account or system by entering your username and password.

How to Use “Sign In” in a Sentence

  • “Sign in with your email and password.”
    A1 daily
  • “I cannot sign in because I forgot my password.”
    A2 daily
  • “All visitors must sign in at the reception desk before entering the building.”
    B1 formal

Synonyms and Antonyms of Sign In

Common Synonyms for Sign In

Smart Synonyms for Sign In — When to Use Each

log in
interchangeable; slightly more technical tone
log on
older term; less common in modern usage
authenticate
formal technical term for verifying identity

Antonyms of Sign In

See all synonyms for “sign in” →

Common Mistakes with “Sign In”

✗ Wrong:
✓ Correct: Sign in to access your existing account.
✗ Wrong:
✓ Correct: Please sign in before you start.

Frequently Asked Questions About Sign In

What is the meaning of "Sign in"?

To enter your details to access an account you already have.

How do you pronounce "Sign in"?

The IPA is /saɪn ɪn/. As a verb, stress falls on 'IN': sign IN. The noun 'sign-in' stresses the first syllable: SIGN-in.

What part of speech is "Sign in"?

"Sign in" is a verb at A2 level (Common European Framework).

What are synonyms for "Sign in"?

Common synonyms include log in, log on, access.

How do you use "Sign in" in a sentence?

For example: "Sign in with your email and password."

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