Jig  —n. 1 a lively leaping dance. B music for this. 2 device that holds a piece of work and guides the tools operating on it. —v. (-gg-) 1 dance a jig. 2 (often foll. By about) move quickly and jerkily up and down; fidget. 3 work on or equip with a jig or jigs. [origin unknown]