The Collaborative International Dictionary of English v.0.48:
Gig \Gig\, n. [Cf. Icel. g[imac]gja fiddle, MHG. g[imac]ge, G.
geige, Icel. geiga to take a wrong direction, rove at random,
and E. jig.]
1. A top or whirligig; any little thing that is whirled round
Thou disputest like an infant; go, whip thy gig.
2. A light carriage, with one pair of wheels, drawn by one
horse; a kind of chaise.
3. (Naut.) A long, light rowboat, generally clinkerbuilt, and
designed to be fast; a boat appropriated to the use of the
commanding officer; as, the captain's gig.
4. (Mach.) A rotatory cylinder, covered with wire teeth or
teasels, for teaseling woolen cloth.
Gig machine, Gigging machine, Gig mill, or Napping
machine. See Gig, 4.
Gig saw. See Jig saw.