"sound made by a crowing cock," 1570s, imitative; compare French cocorico, German kikeriki, Latin cucurire, Russian kikareku, Vietnamese cuc-cu, Arabic ko-ko, etc., and compare cock (n.1).
cochineal
Cochise
cochlea
cock
cockade
cock-a-doodle-doo
Cockaigne
cockamamie
cockatoo
cockatrice
cockchafer
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