To announce or record one's own arrival at a hotel, airport etc.
We got to the hotel last night and checked in at the front desk.
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To verify a person's information and record their arrival, such as at a hotel, airport, etc.
The clerk checked us in at the front desk.
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To contact another person in order to keep the other person informed of one's situation.
Kelly has to check in with her parole officer today.
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