sign on
动词- To join something, after signing.
- To commit oneself, as to a project, a goal, an organization, a cause. · I never signed on for this.
- 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.
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