check in phrasal verb, verb Meaning in Cambridge American English Dictionary
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Meaning of "check in" - American English Dictionary

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check in

phrasal verb with check  us   /tʃek/ verb
to report your arrival, esp. at an airport or hotel, so that you can get the service you are paying for: Be sure to check in at least an hour before your flight.
(Definition of check in phrasal verb, verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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