c.1435, "dense, close, compact," from M.E. thight, from O.N. şettr "watertight, close in texture, solid," from P.Gmc. *thenkhtuz (cf. second element in O.E. meteşiht "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.