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English definition of “cuckoo”

cuckoo

noun [C] uk   /ˈkʊk.uː/ (plural cuckoos) us  
a grey bird with a two-note call that sounds similar to its name. Cuckoos lay their eggs in other birds' nests.Other wild birdsBirds which live by or on inland waterBirds of prey

cuckoo

adjective uk   /ˈkʊk.uː/ informal us  
silly or crazyStupid and sillyOf unsound mind
(Definition of cuckoo from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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