To announce or record one's own arrival at a hotel, airport etc. / To verify a person's information and record their arrival, such as at a hotel, airport, etc.

The act of checking in at a hotel, airport, etc. / (computing) The submission of source code or other material to a source control repository.

Third-person singular simple present indicative form of check in

simple past tense and past participle of check in

A surname.

plural of Check

Under restraint or control.

(transitive) To personally verify that (someone or something) is safe, copacetic, appropriate or satisfactory.

Third-person singular simple present indicative form of check on

(chess) A situation in which the king is directly threatened by an opposing piece. [from 14th c.] / An inspection or examination. / A control; a limit or stop.