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English definition of “sit in”

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sit in

verb uk phrasal verb with sit   /sɪt/ ( present participle sitting, past tense and past participle sat) us  

(COMPLAIN)

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

(BE PRESENT)

to be present in a meeting or class, watching it but not taking part in it: There will be a school inspector sitting in on your class this morning.
(Definition of sit in phrasal verb, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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