1
general::
Phrase(s): 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?, Phrase(s): 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?, Phrase(s): sign in
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?
McGrawhill's American Idioms And Phrasal Verbs
2
general::
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.
American Heritage Idioms