sign in

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sign in (third-person singular simple present signs in, present participle signing in, simple past and past participle signed in)

1. (idiomatic) To sign one's name on a list when entering somewhere.
   • In order to get into the office after hours, you'll have to sign in at the security desk.
2. (computing) To take some action to access a secured program or web page on a computer; to log in.

• log in
• log on
• sign on

• sign up

• singin'