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be on/off the air
be on/off (the) air► C1 If a programme or a person is on/off (the) air, they are/are not broadcasting on radio or television: » The radio station is on air from 6 a.m.» As soon as the war started, any broadcasts with a military theme were taken off the air.Thesaurus+: ↑Broadcasting in generalMain Entry: ↑air
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