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 join something, after signing.
To begin broadcasting a radio or television signal, usually at the beginning of a broadcasting day and after being off the air for several hours.
To commit oneself, as to a project, a goal, an organization, a cause.
To apply to receive unemployment benefits.
To log on; to start using a computer, radio, etc., or to start talking.
The time of day when a radio or television station begins broadcasting, usually after being off the air for several hours.