/ ˈkʊkuː; NAmE / noun , adjective
■ noun
( pl. -oos ) a bird with a call that sounds like its name. Cuckoos leave their eggs in the nests of other birds.
—see also cloud cuckoo land
■ adjective
[ not before noun ] ( old-fashioned , informal ) crazy
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WORD ORIGIN
Middle English : from Old French cucu , imitative of its call.