The broadcasting of a program on radio or television, or the act of exposing something to fresh air.
From air plus -ing suffix. Originally meant exposing to air for freshening or drying, later extended to broadcasting as programs are transmitted through airwaves.
The evolution from 'hanging laundry out to air' to 'airing a TV show' beautifully captures how broadcasting metaphors draw from domestic life - both involve making something public and fresh.
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