Word Origin & History
tightc.1435, "dense, close, compact," from M.E. thight, from O.N. þettr "watertight, close in texture, solid," from P.Gmc. *thenkhtuz (cf. second element in O.E. meteþiht "stout from eating;" M.H.G. dihte "dense, thick," Ger. dicht "dense, tight," O.H.G. gidigan, Ger. gediegen "genuine, solid,
worthy"), from PIE base *tenk- "to become firm, curdle, thicken" (cf. Ir. techt "curdled, coagulated," Lith. tankus "close, tight," Pers. tang "tight," Skt. tanakti "draws together, contracts"). Sense of "drawn, stretched" is from 1576; meaning "fitting closely" (as of garments) is from 1779; that of "evenly matched" (of a contest, bargain, etc.) is from 1828, Amer.Eng.; that of "drunk" is from 1830; that of "close, sympathetic" is from 1956. Tightrope is recorded from 1801. Tight-assed "unwilling to relax" is attested from 1903. Tight-laced is recorded from 1741 in both the lit. and fig. senses. Tight-lipped is first attested 1876.
sitO.E. sittan "to be seated, to seat oneself" (class V strong verb; past tense sæt, pp. seten), from P.Gmc. *setjanan (cf. O.S. sittian, O.N. sitja, O.Fris. sitta, M.Du. sitten, Du. zitten, O.H.G. sizzan, Ger. sitzen, Goth. sitan), from PIE base *sed- "to sit" (see
sedentary). In ref. to a legislative assembly, from 1518. Meaning "to baby-sit" is recorded from 1966. Sitting room first recorded 1771. Slang sitting duck "easy target" first recorded 1944; lit. sense is from 1867 (it is considered not sporting to shoot at one). Sitting pretty is from 1921. 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, Amer.Eng. To sit out "not take part" is from 1626.