Etymology
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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."

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Definitions of sit-in

sit-in (n.)
a form of civil disobedience in which demonstrators occupy seats and refuse to move;
From wordnet.princeton.edu