I.to fortify on all sides or strongly, to secure, barricade, intrench (class.).
I. Prop.: “castella,” Caes. B. G. 1, 8; Nep. Alcib. 7, 4: “castra,” Caes. B. G. 5, 49; Liv. 2, 32, 4; 21, 32, 11; 42, 58, 1: “loca castellis idonea,” Nep. Milt. 2, 1: “hibernacula,” Liv. 22, 32, 1: “praesidium,” id. 2, 49, 8: “tumulum,” Caes. B. C. 1, 43.—Transf.: “os arteriae,” Gell. 17, 11, 5.—
II. Trop., to make sure, to strengthen: “auctoritatem aulae,” Cic. Fam. 15, 4, 6 (cf. aula, II. A.): “causam testimoniis,” id. Rosc. Com. 15, 43: “jus,” id. Caecin. 26, 74.