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English definition of “check in”

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check in

verb uk phrasal verb with check   /tʃek/ us  
B1 to show your ticket at an airport so that you can be told where you will be sitting and so that your bags can be put on the aircraft: Passengers are requested to check in two hours before the flight. You can save time by checking on online.
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(Definition of check in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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