sign out phrasal verb ( see also ↑ sign )
1 . to write your name in a book when you leave a place such as a hotel, an office, or a club
2 . sign something ↔ out to write your name on a form or in a book to show that you have taken or borrowed something:
Bernstein signed out a company car.
3 . sign somebody ↔ out to write in a book that someone is allowed to leave somewhere such as a school, an office etc:
Parents must sign pupils out when collecting them for doctor’s or dentist’s appointments.