FROM STRONG’S HEBREW DICTIONARY (1890)

Strong’s Hebrew Dictionary (1890) — public domain, printed whole.

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