expiate Copy link Outline 1. expio, 1 (by sacrifices, etc.)2. pio, 1 (chiefly poet.) • expiate: 1. expio, 1 (by sacrifices, etc.): to e. a crime, scelus ex., Hor.: to be e.d by the punishment of (the criminal) himself, ipsius supplicio expiari, Cic. Join: procurare atque expiare (with ref. to portents), Cic. Div. 2, 63, 130. 2. pio, 1 (chiefly poet.): v. to atone for.