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English definition of “sit-in”

sit-in

noun [C] uk   /ˈsɪt.ɪn/ us    /ˈsɪt̬-/
an occasion when a group of people go into a public building and refuse to leave or allow normal activities to continue there until a situation that they are complaining about is changed: Students staged a sit-in in the university offices as part of their protest campaign.
See also
Activism and pressure groups
(Definition of sit-in noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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