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Cosy (adjective)
Affording comfort and warmth; snug; social
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Cosy (noun)
A padded or knit covering put on an item to keep it warm, especially a teapot or egg.
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Cosy (noun)
A padded or knit covering for any item (often an electronic device such as a laptop computer).
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Cosy (noun)
A work of crime fiction in which sex and violence are downplayed or treated humorously, and the crime and detection take place in a small, socially intimate community.
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Cosy (verb)
To become snug and comfortable.
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Cosy (verb)
To become friendly with.
“He spent all day cosying up to the new boss, hoping for a plum assignment.”
Wiktionary