check in

verb checks in · checking in · checked in

1. 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.
2. 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.

   Opposite: check out

3. 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.
4. transitive To return (a book to a library, source code to a repository, etc.).
5. To visit in order to see how someone is doing. I just wanted to check in after your accident. How are you recovering?
6. intransitive, slang To enter solitary confinement at one's own request for protection from other prisoners. If an authority exists other than that of the pigs, gay victims of homophobia will not have to check in (into protective custody).
7. slang, transitive To send somebody to solitary confinement; to make somebody be admitted to solitary confinement.

   Similar: send up top

8. To integrate new revisions into the public or master version of a file in a version control system.

   Similar: commit

9. Netherlands, intransitive to tap on, to touch in, to tap in (to use a smartcard to start a public transport journey) So how exactly does checking in work? When boarding the bus, tram, metro or train, hold the OV-chipkaart (or your debit card, smartphone, or wearable if using OVPay) in front of the screen of a post or gate. It will indicate with a green light and a beep that the anonymous OV-chipkaart has been read