To hand over (something to someone), place into the care or control of another.
To quit (a job or position).
To submit passively; to give up as hopeless or inevitable.
To give up; to relinquish ownership of.
to give one's official approval to something for which it is needed
To log off; to stop using a computer, radio, etc., especially to stop talking.
To cease broadcasting a radio or television signal, usually at the end of a broadcasting day.
The closing of a radio or television station's studios and cessation of the broadcasting signal, usually overnight.