sign on

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun broadcasting The time of day when a radio or television station begins broadcasting, usually after being off the air for several hours.
• verb To join something, after signing.
• verb To commit oneself, as to a project, a goal, on organization, a cause.
• verb broadcasting 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.
• verb idiomatic To log on; to start using a computer, radio, etc., or to start talking.
• verb UK, intransitive To receive unemployment benefits.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb engage by written agreement