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[sit-in] /ˈsɪtˌɪn/
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.
an organized passive protest, especially against racial segregation, in which the demonstrators occupy seats prohibited to them, as in restaurants and other public places.
Origin of sit-in
1955-60; noun use of verb phrase sit in (a place); cf. sit1, -in3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for sit-in


a form of civil disobedience in which demonstrators occupy seats in a public place and refuse to move as a protest
another term for sit-down strike
verb (intransitive, adverb)
(often foll by for) to deputize (for)
(foll by on) to take part (in) as a visitor or guest: we sat in on Professor Johnson's seminar
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
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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
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Slang definitions & phrases for sit-in



An illegal occupation of a place in order to make a political or philosophical statement

[1960s+; the term was popularized during the movement for black civil rights and has many offspring: be-in, love-in, puke-in, etc]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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