sit in Meaning in the Cambridge English Dictionary
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Meaning of “sit in” in the English Dictionary

"sit in" in British English

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sit in

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

sit in (COMPLAIN)

to go as a ​group into a ​publicbuilding and ​refuse to ​leave or to ​allownormalactivities to ​continue there until a ​situation that you are ​complaining about is ​changed
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sit in (BE PRESENT)

to be ​present in a ​meeting or ​class, ​watching it but not taking ​part in it: There will be a ​schoolinspectorsitting in onyourclass this ​morning.

sit-innoun [C]

uk   /ˈsɪt.ɪn/  us   /ˈsɪt̬-/
an ​occasion when a ​group of ​people go into a ​publicbuilding and ​refuse to ​leave or ​allownormalactivities to ​continue there until a ​situation that they are ​complaining about is ​changed: Students ​staged a sit-in in the ​universityoffices as ​part of ​theirprotestcampaign.
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(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

sit in (BE PRESENT)

to be ​present at an ​event without being ​involved: Do you ​mind if I sit in on ​yourclass?

sit in

phrasal verb with sit  us   /sɪt/ verb

sit in (ACT FOR SOMEONE)

to ​fulfill a ​responsibility for another ​person: The ​vicepresident will sit in for the ​president at today’s ​meeting. A ​musician who sits in ​playsmusic 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 ​publicevent in which a ​person or ​groupenters a ​place and ​refuses to ​leave until ​certaindemands have been ​agreed to: Students ​carried out a sit-in at the governor’s ​office to ​protesthighertuitioncosts.
(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 ​peopleprotest 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 ​billlaunched 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)
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