What is the meaning of Check_in?

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.

To contact another person in order to keep the other person informed of one's situation.

To return (a book to a library, source code to a repository, etc.).

To visit in order to see how someone is doing.

To enter solitary confinement at one's own request for protection from other prisoners.

To send somebody to solitary confinement; to make somebody be admitted to solitary confinement.

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

inflection of inchecken:

  1. first-person singular present indicative
  2. (in case of inversion) second-person singular present indicative
  3. imperative

first-person singular present indicative

(in case of inversion) second-person singular present indicative

imperative

Source: wiktionary.org