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- DictionaryCuck·oo/ˈko͞oˌko͞o/
noun
- 1. a medium-sized long-tailed bird, typically with a gray or brown back and barred or pale underparts. Many cuckoos lay their eggs in the nests of small songbirds.
- 2. a mad person. informal
adjective
- 1. mad; crazy: informal "people think you're cuckoo"