American English

Definition of sign in/out phrasal verb from the Oxford Advanced American Dictionary

 

sign in/out

 phrasal verb
phrasal verb
 
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Phrasal Verbs

sign in/out

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sign somebodyin/out

 
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to write your/someone's name when you arrive at or leave an office, a club, etc. All visitors must sign in on arrival. You must sign guests out when they leave the club.