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English definition of “fit in”

fit in

verb uk phrasal verb with fit   /fɪt/ (-tt-) us  
C1 to feel that you belong to a particular group and are accepted by that group: It's no surprise she's leaving - she never really fitted in.Suitable and acceptableQuite good, or not very good B2 If one thing fits in with another thing, they look pleasant together or are suitable for each other: It's a very nice sofa but it doesn't fit in with the rest of the room.Being suitable or unsuitable
(Definition of fit in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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