check in Meaning, definition in Cambridge English Dictionary
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Meaning of "check in" - English Dictionary

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check in

phrasal verb with check uk   us   /tʃek/ verb
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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