n. Either of the two protuberances which form the rump in men and animals; in the plural, the rump; the gluteal region of the body, more protuberant in man than in any other animal; the bottom.n. The upper aftermost portion of the continuation of the contour of a ship's bottom. Thearle, Naval Arch.n. In coal-mining, the portion of a face of coal ready to be next taken down.n. A piece of armor for the rump of a horse. See croupière.