Traveling or moving quickly, or improvising without careful preparation; often used in the phrase 'winging it.'
From 'wing' (the appendage used for flying), combined with the present participle suffix '-ing.' The verb meaning 'to improvise' developed from the idea of flying without a set course.
The phrase 'winging it' probably comes from theater actors who had to improvise when they forgot their lines—they'd have to 'wing' it onstage, much like a bird improvises in flight.
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