Outing

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late Middle English (in the sense ‘the action of going out or of expelling’): from the verb out + -ing1.

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etymonline

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outing (n.)

late 14c., "action of going out, an issuing forth;" mid-15c., "act of putting or driving out, expulsion, ejection;" verbal noun from out (v.). Original senses are now obsolete. The meaning "an excursion, a pleasure-trip" is from 1821.