sign on

noun

1
The time of day when a radio or television station begins broadcasting, usually after being off the air for several hours.
“Sign on for the radio station is at 5 a.m.”

verb

1
To join something, after signing.
2
To commit oneself, as to a project, a goal, on organization, a cause.
“I never signed on for this.”
3
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.”
4
To log on; to start using a computer, radio, etc., or to start talking.
5
To apply to receive unemployment benefits.

noun

1
The username and password for logging in to a computer account.
2
An attempt to log in.
3
(more generally) An instance of signing on to something.
4
A person who signs on to something.
5
A verbal script that is repeated at the start of every instance of something, as a form of greeting and identification.
6
A signing bonus.

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