cuckoo - Dictionary definition and pronunciation - Yahoo! Education
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cuck·oo  audio  (kk, kk) KEY 

NOUN:
pl. cuck·oos
    1. A grayish European bird (Cuculus canorus) that has a characteristic two-note call and lays its eggs in the nests of birds of other species.
    2. Any of various related birds of the family Cuculidae, having grayish-brown plumage and a slender body.
  2. The call or cry of one of these birds.
  3. Slang A foolish or crazy person.
TRANSITIVE VERB:
cuck·ooed, cuck·oo·ing, cuck·oos
To repeat incessantly, as a cuckoo does its call.
ADJECTIVE:
Slang
Lacking in sense; foolish or crazy.
ETYMOLOGY:
Middle English cuccu, of imitative origin


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