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.

To make the call of a cuckoo. / To repeat something incessantly.

(slang) Crazy; not sane.

plural of cuckoo

Third-person singular simple present indicative form of cuckoo

present participle of cuckoo

The call of a cuckoo. / (UK) A form of crime in which the home of a vulnerable person is taken over by a criminal gang and used by them as a base for their activities.

simple past tense and past participle of cuckoo

plural of cuckooing

(colloquial) madness; craziness; eccentricity