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English definition of “sit in”

sit in

(BE PRESENT) phrasal verb with sit     /sɪt/ verb (present participle sitting, past tense and past participle sat)
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 .PresentAvailable and accessibleUnavailable and inaccessible
(Definition of sit in (BE PRESENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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