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 integrate new revisions into the public or master version of a file in a version control system.
To visit in order to see how someone is doing.
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 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 appear, arrive, or attend, especially suddenly or erratically.
To make visible or expose faults and deficiencies in, usually by outdoing, outperforming, or outcompeting another.
To make visible; to expose.
To be easily visible; to be conspicuous.