chagag (Hebrew #2287)
properly, to move in a circle, i.e. (specifically) to march in a sacred procession, to observe a festival; by implication, to be giddy
KJV usage: celebrate, dance, (keep, hold) a (solemn) feast (holiday), reel to and fro.
Pronounce: khaw-gag'
Origin: a primitive root (compare 2283, 2328)