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cuckoo

A cuckoo is a type of grayish colored European bird that lays its eggs in the nests of other types of birds, the sound that this type of bird makes or is slang for a crazy person. (noun)

An example of cuckoo is the sound made by a bird clock from the Black Forest in Germany.

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See cuckoo in Webster's New World College Dictionary

See cuckoo in American Heritage Dictionary 4

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