I.a lying down (very rare).
I. Prop.: “supini, proni, in latera,” Plin. 28, 4, 14, § 54.—
B. Esp., of coitus (for concubitus), in plur., Plaut. Am. 5, 1, 70.—
II. Meton. (abstr. pro concr.), a bed, couch: “foliis cubitus sibi sternunt,” Plin. 24, 9, 38, § 59.