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English definition of “sit in”

sit in

phrasal verb with sit     /sɪt/ verb (present participle sitting, past tense and past participle sat)
to go to a meeting or class to watch : I sat in on a couple of classes before choosing a course .PresentAvailable and accessibleUnavailable and inaccessible
(Definition of sit in from the Cambridge Learner's Dictionary © Cambridge University Press)

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