Meaning of “sit in” in the English Dictionary

"sit in" in British English

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sit-innoun [ C ]

uk /ˈsɪt.ɪn/ us /ˈsɪt̬.ɪn/

(Definition of “sit in” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sit in" in American English

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sit in

phrasal verb with sit us /sɪt/ verb

(BE PRESENT)

to be present at an event without being involved:

Do you mind if I sit in on your class?

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.

sit-innoun [ C ]

us /ˈsɪt̬ˌɪn/

social studies a public event in which a person or group enters a place and refuses to leave until certain demands have been agreed to:

Students carried out a sit-in at the governor’s office to protest higher tuition costs.

(Definition of “sit in” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"sit-in" in Business English

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sit-innoun [ C ]

uk us WORKPLACE, HR

a situation in which a group of people protest by sitting down and refusing to leave until their complaints are dealt with:

a 24-hour/30-day/3 week, etc. sit-in Opponents of the bill launched a 40-day, 24-hour sit-in outside the building.
hold/stage a sit-in

(Definition of “sit-in” from the Cambridge Business English Dictionary © Cambridge University Press)