Noun:
1. A type of bird known for its distinctive call and habit of laying its eggs in the nests of other birds for them to raise.
2. A person perceived as foolish or eccentric, often used in a derogatory manner.
3. An informal term used to describe someone who lives off others or takes advantage of situations, similar to a parasite.
4. In mechanics, a cuckoo clock is a clock with a mechanical bird that emerges and makes a "cuckoo" sound to mark the hour.
Verb:
1. To make a sound like a cuckoo bird, often associated with the call of the cuckoo bird.
2. To lay one's eggs in the nest of another bird for them to raise, practicing brood parasitism.
Adjective:
1. Relating to or resembling a cuckoo, especially in behavior or appearance.
2. Foolish or eccentric; often used in an informal and derogatory manner.