Commorior, commóreris, pen. cor. commortuus sum, cómmori, pen. cor. Plin. To die with one.Commorientes. Ter. They that die togither.
Lewis and Short: Latin dictionary
com-mŏrĭor (conm-), mortuus, 3, v. dep. n., to die with or at the same time with one (mostly post-Aug.; not in Cic.); constr. with cum, with the dat. or absol.(a). With cum: in acie cum Arunte commortuus est (Brutus), Liv. Epit. 2; Val. Max. 6, 8, 2.—(b). With dat.: obviam ire et commori hostibus, Sall. H. 1, 89 Dietsch: hostibus suis morte suā, Flor. 1, 18, 17; so, tibi, Sen. Ep. 77, 13: simul tibi, Vulg. Marc. 14, 31.—(g).Absol., Plin. 8, 11, 11, 32; 10, 21, 24, 47; Vulg. Ecclus. 19, 10.—Hence, Commŏrĭentes, the title of a comedy of Piautus, now lost, composed in imitation of the *sunapoqnh/skontes of Diphilus, Ter. Ad. prol. 7, and Prisc. p. 725 P. (acc. to Att. ap. Gell. 3, 3, 9, not genuine).—II.Trop.: duo venena commoriuntur, i. e.