jig·ger¹ / ˈjigər/ • n. 1. a machine or vehicle with a part that rocks or moves back and forth, e.g., a jigsaw. 2. a person who dances a jig. 3. a small fore-and-aft sail set at the stern of a ship. ∎  a small tackle consisting of a double and single block or two single blocks with a rope. 4. a measure or small glass of spirits or wine. 5. dated Golf a metal golf club with a narrow face. 6. used to refer to a thing whose name one does not know or does not wish to mention: see them little jiggers? • v. [tr.] inf. rearrange or tamper with.PHRASES: well, I'll be (or I'm) jiggered used to express one's astonishment.jig·ger² • n. variant spelling of chigger.

jigger1 †dancer of a jig XVII; (naut.) small tackle; and in various names of mechanical contrivances similar to those called jig XVIII. f. prec. + -ER1.

jigger2 XVIII. Later var. of CHIGOE.

jigger Measuring cup used by bar staff for spirits, etc., when the bottles do not have a dispenser fitted.