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sign someone in
to record that someone has arrived somewhere and at what time by recording the information on a paper or a list. I will sign you in. What is your name? Do I have to sign in everyone?
sign something in
to record that something has been received at a particular time by recording the information on a paper or a list. I have to sign this package in, then I will be right with you. should I sign in this shipment now?
to indicate that one has arrived somewhere and at what time by signing a piece of paper or a list. Please sign in so we will know you are here. Did you remember to sign in this time?
Record one's arrival by signing a register, as in He signed in both himself and his wife. [c. 1930] For the antonym, see sign out.
1. To record the arrival of someone by signing a register: We went to the front desk to sign in. I got to the hotel first and signed us in.
2. To provide the necessary information to a computer for someone to be allowed to access computer resources: I signed in on the bank's website and checked my account statement. I'll sign you in using my password so you can access the website's subscriber features.