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Pronunciation varies by accent · noun
(radio, television) The point when a radio or television station shuts down transmission and goes off the air for a predetermined period, as used to happen overnight..
Use close down when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Close down means (radio, television) The point when a radio or television station shuts down transmission and goes off the air for a predetermined period, as used to happen overnight..
Common synonyms include closure, closing, shutdown.
The opposite depends on the specific sense.
Use close down where its definition matches the intended context.
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