go by the board »
To estimate the velocity of a boat or ship in knots by casting overboard the knotted line to whose end is attached the lead and thereafter counting the knots in the line as it goes aft along the side boards of the vessel.
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sign off »
Term used to describe the closing of a radio or television station's studios and cessation of a broadcasting signal, usually during the overnight hours.
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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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