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sit in for sb

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

Definition

to take the place of someone who would normally do a particular job or go to a particular meeting: Mr Baker is ill today, so Miss Dixon is sitting in for him (as your teacher).Replacing and exchanging
(Definition of sit in for sb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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