Lewis Short
(verb) : sīdo, sīdi, 3, cf. sedeo; Gr. ἵζω
* To seat one's self, sit down; to settle, alight (poet. and in post-Aug. prose; usu. of things)
* In gen.: quaesitisque diu terris, ubi sidere detur,Ov. M. 1, 307; cf.: (columbae) super arbore sidunt,Verg. A. 6, 203: canes sidentes,sitting down,Plin. 10, 63, 83, § 177.
* Of things, to sink down, settle: sidebant campi (shortly after: subsidere saxa),Lucr. 5, 493: nec membris incussam sidere cretam,id. 3, 382; cf. Col. 12, 24, 2: in tepidā aquā gutta (balsami) sidens ad ima vasa,Plin. 12, 25, 54, § 123: cummi in aquā sidit,id. 12, 25, 54, § 121: cave lecticā sidat,be set down,Prop. 4 (5), 8, 78. prius caelum sidet inferius mari, Quam, etc.,Hor. Epod. 5, 79.
* In partic., pregn.
* To sit or be set fast; to remain sitting, lying, or fixed: mare certis canalibus ita profundum, ut nullae ancorae sidant,can hold,Plin. 6, 22, 24, § 82: secures sidunt,id. 16, 10, 19, § 47: tum queror, in toto non sidere pallia lecto,remain lying,Prop. 4 (5), 3, 31.
* Naut. t. t., of a vessel, to stick fast on shallows: veniat mea litore navis Servata, an mediis sidat onusta vadis,Prop. 3, 14 (3, 6), 30; cf.: ubi eae (cymbae) siderent,Liv. 26, 45; Quint. 12, 10, 37; Tac. A. 1, 70; 2, 6; Nep. Chabr. 4, 2.
* To sink down, to sink out of sight.
* Lit.: non flebo in cineres arcem sidisse paternos Cadmi,Prop. 3, 9 (4, 8), 37: sidentes in tabem spectat acervos, settling or melting down, Luc. 7, 791; cf. Stat. S. 5, 3, 199.
* Trop.: vitia civitatis pessum suā mole sidentis,sinking,Sen. Const. 2; cf.: sidentia imperii fundamenta,Plin. 15, 18, 20, § 78: sidente paulatim metu,Tac. H. 2, 15.
Charlton T. Lewis, Charles Short, A Latin Dictionary