An example of a jig is what someone fishing off the side of a pier would use as bait.
An example of jig is the movement of Irish folk dancers.
An example of a jig is Irish set dancing.
An example of a jig is a pattern for a curve which is used to create multiple curved shelves.
They danced a jig.
Cutting circles out of pinewood is best done with a compass-style jig.
The guests were jigging around on the dancefloor.