Old English sittan "to occupy a seat, be seated, sit down, seat oneself; remain, continue; settle, encamp, occupy; lie in wait; besiege" (class V strong verb; past tense sæt, past participle seten), from Proto-Germanic *setjan (cf. Old Saxon sittian, Old Norse sitja, Danish sidde, Old Frisian sitta, Middle Dutch sitten, Dutch zitten, Old High German sizzan, German sitzen, Gothic sitan), from PIE root *sed- (1) "to sit" (see sedentary).
With past tense sat, formerly also set, now restricted to dialect, and sate, now archaic; and past participle sat, formerly sitten. In reference to a legislative assembly, from 1510s. Meaning "to baby-sit" is recorded from 1966.
To sit back "be inactive" is from 1943. To sit on one's hands was originally "to withhold applause" (1926); later, "to do nothing" (1959). To sit around "be idle, do nothing" is 1915, American English. To sit out "not take part" is from 1650s. Sitting pretty is from 1916.
[found by 1599 in the first sense ''to participate in a game'']
To take care of; attend and watch over: Who'll sit your house while you're gone? (1945+)
Related TermsAn 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]
a tactic of nonviolent civil disobedience. The demonstrators enter a business or a public place and remain seated until forcibly evicted or until their grievances are answered. Attempts to terminate the essentially passive sit-in often appear brutal, thus arousing sympathy for the demonstrators among moderates and noninvolved individuals. Following Mahatma Gandhi's teaching, Indians employed the sit-in to great advantage during their struggle for independence from the British. Later, the sit-in was adopted as a major tactic in the civil-rights struggle of American blacks; the first prominent sit-in occurred at a Greensboro (North Carolina) lunch counter in 1960. Student activists adopted the tactic later in the decade in demonstrations against the Vietnam War.