sign on

verb

Nonstandard spelling of sign-on.
“After 12:30 p.m., no new sign ons are permitted.”
“However, this commitment today is a strong sign of the level of support being received from the hotel industry, especially in the top line four and five star hotels. “I am confident that the stream of sign ons will continue in the run-up to the cut-off date of the rebate scheme of December 31."”

To join something, after signing.
To commit oneself, as to a project, a goal, an organization, a cause.
“I never signed on for this.”
“By January of 1996 President Clinton himself had apparently signed on with his declaration in the State of the Union message that "the era of big government is over."”
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.
“Years ago, the TV station would sign on at 5 a.m., but now it broadcasts 24 hours a day.”
To log on; to start using a computer, radio, or other multicast device; to start talking.
“Edward ran a pale hand through his perfect golden-bronze hair, then signed on to 4chan.org, the darkest place on the Internet, where all his vampire compatriots spent their time.”
To apply to receive unemployment benefits.
“Oh, one thing led to another; you know. I just sort of faffed around — I just did odd jobs; and sometimes in between I signed on.”