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sit-in

[sit-in]
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noun
  1. any organized protest in which a group of people peacefully occupy and refuse to leave a premises: Sixty students staged a sit-in outside the dean's office.
  2. an organized passive protest, especially against racial segregation, in which the demonstrators occupy seats prohibited to them, as in restaurants and other public places.
  3. sit-down strike.

Origin of sit-in

1955–60; noun use of verb phrase sit in (a place); cf. sit1, -in3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for sit-in

sit-in

noun
  1. a form of civil disobedience in which demonstrators occupy seats in a public place and refuse to move as a protest
  2. another term for sit-down strike
verb sit in (intr, adverb)
  1. (often foll by for) to deputize (for)
  2. (foll by on) to take part (in) as a visitor or guestwe sat in on Professor Johnson's seminar
  3. to organize or take part in a sit-in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for sit-in

1936, in reference to session musicians; 1937, in reference to union action; 1941, in reference to student protests. From the verbal phrase; see sit (v.) + in (adv.). To sit in is attested from 1868 in the sense "attend, be present;" from 1919 specifically as "attend as an observer."

Online Etymology Dictionary, © 2010 Douglas Harper