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