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English definition of “sit on sb”

sit on sb

informal phrasal verb with sit     /sɪt/ verb (present participle sitting, past tense and past participle sat)
to force someone to be silent or not to do something: The boss is going to sit on him to make sure he says nothing.Limiting and restrictingPreventing and impeding
(Definition of sit on sb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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