sign off
verbe- To log off; to stop using a computer, radio, etc.; especially, to stop talking. · He finished the conversation and signed off.
- To cease broadcasting a radio or television signal, usually at the end of a broadcasting day. · Before he signed off the radio station for the night, the disc jockey played the National Anthem.
- to give one's official approval to something for which it is needed, especially by a signature. · Once the vice-president signs off on the project, we can start construction.
- To use a valediction, such as the end of a letter or broadcast.
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