sit in phrasal verb, verb Meaning in Cambridge American English Dictionary
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Meaning of "sit in" - American English Dictionary

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sit in

phrasal verb with sit  us   /sɪt/ verb

(ACT FOR SOMEONE)

to fulfill a responsibility for another person: The vice president will sit in for the president at today’s meeting. A musician who sits in plays music with someone the musician does not usually play with: Jeanne needed a drummer and asked if I could sit in.
(Definition of sit in phrasal verb, verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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