verb (used with object), ex·pi·at·ed, ex·pi·at·ing. to atone for; make amends or reparation for: to expiate one's crimes.
Origin: 1585–95; <
Latin expiātus (past participle of
expiāre to atone for, make good), equivalent to
ex- ex-1 +
piā(
re) to propitiate (see
pious) +
-tus past participle suffix
Related forms ex·pi·a·tor, noun
un·ex·pi·at·ed, adjective