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check in

check in

 
See:
check
part of speech: phrase
definition 1: to register at a hotel, conference, or the like, or to give official confirmation of one's intention to travel imminently.
definition 2: to telephone or appear in person, esp. periodically, so as to obtain information or confirm one's interest or involvement.
The doctor checked in frequently to see how her patient was doing.I checked in every hour or so to see what was happening in the election.