chasak (Hebrew #2820)
to restrain or (reflex.) refrain; by implication, to refuse, spare, preserve; also (by interch. with 2821) to observe
KJV usage: assuage, X darken, forbear, hinder, hold back, keep (back), punish, refrain, reserve, spare, withhold.
Pronounce: khaw-sak'
Origin: a primitive root