Sack, n. [OE. sak, sek, AS. sacc, sæcc, L. saccus, Gr. σάκκοσ from Heb. sak; cf. F. sac, from the Latin. Cf. Sac, Satchel, Sack to plunder.] 1. A bag for holding and carrying goods of any kind; a receptacle made of some kind of pliable material, as cloth, leather, and the like; a large pouch.
2. A measure of varying capacity, according to local usage and the substance. The American sack of salt is 215 pounds; the sack of wheat, two bushels. McElrath.
3. Originally, a loosely hanging garment for women, worn like a cloak about the shoulders, and serving as a decorative appendage to the gown; now, an outer garment with sleeves, worn by women; as, a dressing sack. [Written also sacque.]
4. A sack coat; a kind of coat worn by men, and extending from top to bottom without a cross seam.
5. (Biol.) See 2d Sac, 2.
Sack bearer(Zoöl.). See Basket worm, under Basket. — Sack tree(Bot.), an East Indian tree (Antiaris saccidora) which is cut into lengths, and made into sacks by turning the bark inside out, and leaving a slice of the wood for a bottom. — To give the sack toorget the sack, to discharge, or be discharged, from employment; to jilt, or be jilted.