Sign-on meaning

(broadcasting) 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.

noun
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To join something, after signing.
verb
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See log in and Synon/2E.
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To commit oneself, as to a project, a goal, on organization, a cause.

I never signed on for this.

verb
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(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.

Years ago, the TV station would sign on at 5 a.m., but now it broadcasts 24 hours a day.

verb
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(idiomatic) To log on; to start using a computer, radio, etc., or to start talking.
verb
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(UK, intransitive) To receive unemployment benefits.
verb
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