Word Origin & History
cuckooc.1240, from O.Fr. cucu, echoic of the male bird's mating cry (cf. Gk. kokkyx, L. cuculus, Skt. kokilas). Slang sense of "crazy" (adj.) is Amer.Eng. 1918, but noun meaning "stupid person" is first recorded 1581, perhaps from the bird's unvarying, oft-repeated call. The O.E. was geac, cognate with O.N.
EXPANDgaukr, source of Scot. and northern Eng. gowk. The Gmc. words were presumably originally echoic, too, but had drifted in form and were replaced by the Fr. form. Cuckoo clock is from 1789.
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