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Verb: check in
  1. Announce one's arrival, e.g. at hotels or airports
    - sign in
Noun: check-in  'chek,in
  1. The act of reporting your presence (as at an airport or a hotel)

Derived forms: checked in, checking in, check-ins, checks in

Type of: arrival, report

Antonym: check out

Encyclopedia: Check in

Check-in