Lewis & Short

† cymba (cumba), ae, f., = κύμβη,

  1. I. a boat, skiff, first used by the Phœnicians, Plin. 7, 55, 57, § 208; Afran. in Non. p. 535, 31; Cic. Off. 3, 14, 59; Ov. M. 1, 293; id. F. 6, 777 al.
    In partic., the boat of Charon which transported the dead, Verg. A. 6, 303; Hor. C. 2, 3, 28; Prop. 3 (4), 18, 24; Stat. S. 2, 1, 186.
  2. II. Trop.: non est ingenii cymba gravanda tui, i. e. meddle not with themes above your powers, Prop. 3, 3 (4, 2), 22; cf. Ov. A. A. 3, 26; Quint. 12, 10, 37.