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English definition of “sit in”

sit in

(COMPLAIN) phrasal verb with sit     /sɪt/ verb (present participle sitting, past tense and past participle sat)
to go as a group into a public building and refuse to leave or to allow normal activities to continue there until a situation that you are complaining about is changed → See also sit-inComplaining
(Definition of sit in (COMPLAIN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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