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English definition of “sit in”

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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 Learners Dictionary © Cambridge University Press)
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