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jig 1

a. Any of various lively dances in triple time.
b. The music for such a dance. Also called gigue.
2. A joke or trick. Used chiefly in the phrase The jig is up.
3. A typically metal fishing lure with one or more hooks, usually deployed with a jiggling motion on or near the bottom.
4. An apparatus for cleaning or separating crushed ore by agitation in water.
5. A device for guiding a tool or for holding machine work in place.
v. jigged, jig·ging, jigs
1. To dance or play a jig.
2. To move or bob up and down jerkily and rapidly.
3. To operate a jig.
1. To bob or jerk (something) up and down or to and fro.
2. To machine (an object) with the aid of a jig.
3. To separate or clean (ore) by shaking a jig.
in jig time Informal
Very quickly; rapidly.

[Origin unknown.]

jig 2

n. Offensive Slang
Used as a disparaging term for a black person.

[Probably shortening of jigaboo.]
References in classic literature ?
I was tired to death of jigging and gallanting, and that bother about the hornpipes.
Moving to and fro with strained exertion, jabbering the while, they were, with their swaying bodies, black faces, and glowing eyes, like strange and ugly friends jigging heavily in the smoke.
He's empty enough i' the upper story, or he'd niver come jigging an' stamping i' that way, like a mad grasshopper, for the gentry to look at him.
Nick-knock, nick-knock, went the cradle; the candle-flame stretched itself tall, and began jigging up and down; the water dribbled from the matron's elbows, and the song galloped on to the end of the verse, Mrs Durbeyfield regarding her daughter the while.
One of his fore-paws slipped out through the slats or bars and rested on the bottom of the wagon where the trunks were squeaking, screeching, and jigging.
We use Driftmaster Rod Holders with 14-foot ultra-light B'n'M jigging poles, matched with B'n'M ultra-light crappie reels," Watson said.
The diamond jigging chapters are written according to types of fish, whereas the bucktail chapters are written according to types of habitat.
To make jigging work, you need two conditions: 1) A forest floor covered with dry leaves, a common scenario in November whitetail woods; 2) A relatively calm day.
For example, one consultant related how, as a young teenager with a male partner, she represented the Metis by Red River Jigging in two such showcases.
Villareal said the water's drift is also critical to jigging success.
Heller has been very successful with jigging, and has some interesting theories.