Swinging

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Old English swingan ‘to beat, whip’, also ‘rush’, geswing ‘a stroke with a weapon’, of Germanic origin; related to German schwingen ‘brandish’.

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swinging (adj.)

1550s, "moving to and fro," present-participle adjective from swing (v.). Meaning "marked by a free, sweeping movement" is from 1818. Sense of "uninhibited" is from 1958.