sign out
phrasal verbsign in/out | sign somebody  in/out 
- to write your/somebody’s name when you arrive at or leave an office, a club, etc.签到/签退;替某人签到/签退 - All visitors must sign in on arrival.来客均须签到。 
- You must sign guests out when they leave the club.客人离开俱乐部时,你必须为他们签退。 
 
- All visitors must sign in on arrival.