The cuckoo clock itself.
The sound of that particular bird.
A person who inveigles themselves into a place where they should not be (used especially in the phrase a cuckoo in the nest).
Someone who is crazy.
Any of various birds, of the family Cuculidae, famous for laying its eggs in the nests of other species; but especially a common cuckoo (Cuculus canorus), that has a characteristic two-note call.
The bird-shaped figure found in cuckoo clocks.
Crazy; not sane.
To make the call of a cuckoo.
To repeat something incessantly.
Being in a healthy condition; not deranged; thinking rationally.
Mentally sound; possessing a rational mind; having the mental faculties in such condition as to be able to anticipate and judge the effect of one's actions in an ordinary manner.
Rational; reasonable; sensible.