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English definition of “sit in”

sit in

(ACT FOR SOMEONE) phrasal verb with sit    /sɪt/ verb
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 (ACT FOR SOMEONE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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