- a pungent powder or paste prepared from the seeds of certain mustard plants, used as a food seasoning or condiment, and medicinally in plasters, poultices, etc.
- any of various cruciferous plants of the mustard family, noted for their acrid and pungent qualities and widely cultivated for culinary and agricultural purposes: among the most commercially important mustards are black mustard, brown mustard, and white mustard.
- nitrogen mustard.
- to reach or surpass the desired standard of performance: a pitcher who cuts the mustard with his fastball.
- any of several Eurasian plants of the genus Brassica, esp black mustard and white mustard, having yellow or white flowers and slender pods and cultivated for their pungent seeds: family Brassicaceae (crucifers)
- a paste made from the powdered seeds of any of these plants and used as a condiment
- a brownish-yellow colour
- (as adjective)
- zest or enthusiasm
- to come up to expectations
