noun
a bird known for laying its eggs in the nests of other bird species
preposition
used to indicate location or position within a place or thing (in)
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The new employee who was not familiar with the company's procedures stood out like a cuckoo in the nest.
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She felt like a cuckoo in the nest at the family reunion, not knowing anyone there.
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The substitute teacher was like a cuckoo in the nest, trying to control the rowdy students.
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The ambitious intern was seen as a cuckoo in the nest among the seasoned professionals in the office.