- To announce or record one's arrival at a hotel, airport etc.
- To contact another person in order to keep the other person informed of one's situation.
- 2016, Carla Tantillo Philibert, Everyday SEL in Elementary School, →ISBN:
- During the 2 minutes of music, students first PAUSE to check in with how they are feeling.
- (transitive) To return (a book to a library, source code to a repository, etc.).
- To visit in order to see how someone is doing.
- 2017 January 26, Christopher D. Shea, “‘T2 Trainspotting’: The Early Reviews”, in New York Time:
- The sequel checks in with the unmoored but largely lovable characters from the first movie as they face middle age.
to record one's arrival