Cuckoo

Cuckoo

1. A wall or shelf clock that announces intervals of time with a sound imitative of a cuckoo's call and often with the simultaneous emergence of a mechanical bird from a small door. Our cuckoo clock gives its call on the hour.
2. A crazy or foolish person. She went cuckoo when I said no to her suggestion.
3. A cuckoo is also medium-sized birds.

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Shown is a cuckoo clock