Webster's Revised Unabridged Dictionary · 1913

Expiate

Expiate , transitive verb

[Latin expiatus, past participle of expiare to expiate; ex out + piare to seek to appease, to purify with sacred rites, from pius pious. See Pious.]

1.
To extinguish the guilt of by sufferance of penalty or some equivalent; to make complete satisfaction for; to atone for; to make amends for; to make expiation for; as, to expiate a crime, a guilt, or sin.
To expiate his treason, hath naught left. — Milton
The Treasurer obliged himself to expiate the injury. — Clarendon
2.
To purify with sacred rites. [Obsolete]
Neither let there be found among you any one that shall expiate his son or daughter, making them to pass through the fire. — Deut. xviii. 10 (Douay version)

Expiate , adjective

[Latin expiatus,p. p]

Terminated. [Obsolete] — Shakespeare