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sign (sb) in

phrasal verb with sign
 
 
/saɪn/ verb

Definition

to sign your name or the name of someone who is visiting you in a book, in order to be allowed to enter a building such as an office or hotel: New security measures require all visitors to sign in at reception and wear a visitor's badge.Signing and signatures
(Definition of sign (sb) in from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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