什么是 cuckoo?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.Any of various related birds of the family Cuculidae, having grayish-brown plumage and a slender body.The call or cry of one of these birds.Slang A foolish or crazy person.To repeat incessantly, as a cuckoo does its call.Slang Lacking in sense; foolish or crazy.