Plural of gunning; multiple instances of shooting guns or hunting with guns; the act of operating guns.
From 'gun' + '-ing' (present participle suffix). 'Gunning' can mean shooting or hunting with guns, or pursuing something aggressively.
In American slang, 'gunning for someone' means pursuing them aggressively, but originally it literally meant hunting someone with a gun—the metaphor shows how deeply firearms culture shaped English language.
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