I. co ‧ sy 1 BrE AmE British English , cozy American English /ˈkəʊzi $ ˈkoʊzi/ adjective
1 . a place that is cosy is small, comfortable, and warm:
The living room was warm and cosy.
2 . a situation that is cosy is comfortable and friendly:
a cosy chat
3 . having a close connection or relationship, especially one you do not approve of:
He was accused of being too cosy with some clients.
—cosily adverb
—cosiness noun [uncountable]
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THESAURUS
▪ comfortable making you feel physically relaxed, and not too hard, hot, cold etc. Also used about people feeling physically relaxed:
The hotel was very comfortable.
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I tried to get into a more comfortable position.
▪ comfy informal comfortable – used especially about furniture and clothes:
a comfy armchair
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These shoes are very comfy.
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Are you comfy?
▪ cosy British English , cozy American English comfortable and warm – used especially about small rooms, houses etc:
There’s a cosy lounge with a real fire.
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a cozy apartment
▪ snug small, warm, and comfortable, especially in a way that makes you feel protected – used especially about rooms, houses etc. Also used about people feeling warm and comfortable:
It was very cold outside, but our tents were snug and warm.
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She wished she was back in her snug little house.
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I’m snug as a rug in here! (=very snug – an informal use BrE)
▪ smooth a smooth journey is comfortable because your car or plane does not shake, or the sea is not rough:
Did you have a smooth flight?
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a smooth crossing
II. cosy 2 BrE AmE noun ( plural cosies ) [countable] British English
a covering for a ↑ teapot that keeps the tea inside from getting cold too quickly:
a tea cosy