kaphar (Hebrew #3722)
to cover (specifically with bitumen); figuratively, to expiate or condone, to placate or cancel
KJV usage: appease, make (an atonement, cleanse, disannul, forgive, be merciful, pacify, pardon, purge (away), put off, (make) reconcile(-liation).
Pronounce: kaw-far'
Origin: a primitive root