• to show your ticket at an airport so that you can be told where you will be sitting and so that your bags can be put on the aircraft:


    Checking it in meaning & definition 1 of Checking it in.


  • to contact someone by making a phone call, short visit, etc., usually in order to make sure there are no problems or to tell them that there are no problems:

    Checking it in meaning & definition 2 of Checking it in.

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