Meaning

noun music in three-four time for dancing a jig

noun a fisherman's lure with one or more hooks that is jerked up and down in the water

noun a device that holds a piece of machine work and guides the tools operating on it

originUnknown. Derivation from Middle English gyge (“fiddle”), from Old French gigue (“a fiddle”) has been proposed, but the connection and sense development are obscure. The sense “a type of dance” of modern French gigue is borrowed from English.

Etymology from Wiktionary, CC BY-SA 3.0