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English definition of “sign (sb) in”

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sign (sb) in

verb uk phrasal verb with sign   /saɪn/ us  
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.
(Definition of sign (sb) in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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