wiktionary
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cork(“stopper”) + -y
cork(“injure by a blow”) + -y
etymonline
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corky (adj.)
c. 1600, "light, buoyant" (as cork is), hence, figuratively, of persons "lively;" from cork (n.) + -y (2). Of bottled liquors or wine, "having a flavor of cork," by 1840. Related: Corkiness.
