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.
3. the call or cry of one of these birds.
4. slang A foolish or crazy person.
5. to repeat incessantly, as a cuckoo does its call.
6. slang lacking in sense; foolish or crazy.

1. crazy; not sane.
2. any of various birds, of the family Cuculidae (from latin cuculus ("cuckoo")), famous for laying its eggs in the nests of other species; but especially the common cuckoo, Cuculus canorus, that has a characteristic two-note call
3. the sound of that particular bird.
4. the bird shaped figure found in swiss/german clocks (cuckoo clocks) or the clock itself.
5. someone found where they shouldn't be (used especially in the phrase 'A cuckoo in the nest'.)
6. someone who is crazy.
7. to make the call of a cuckoo
8. to repeat something incessantly

1. A bird belonging to Cuculus, Coccyzus, and several allied genera, of many species.

1. A bird of the family Cuculidœ, and especially of the subfamily Cuculinœ or genus Cuculus: so called from its characteristic note.
2. A simpleton; a fool: used in jest or contempt, like the ultimately related gowk.

1. any of numerous european and north american birds having pointed wings and a long tail
2. repeat monotonously, like a cuckoo repeats his call
3. a man who is a stupid incompetent fool