check in

  1. zameldować się (w hotelu) / report that you arrived at a hotel
    You must have your ID to check in at the hotel.
  2. zgłosić się do odprawy (na lotnisku) / report at the airport with your ticket and luggage
  3. check sb in, check in sb – zameldować kogoś (w hotelu) / report that sb has arrived at a hotel
  4. check sth in, check in sth – zgłosić coś do odprawy / officially say at the airport that you have sth you will travel with etc.