If you expunge something, you get rid of it completely, because it causes problems or bad feelings.
例句
The revolutionaries expunged domestic opposition...革命者肅清了國(guó)內(nèi)敵對(duì)勢(shì)力。The experience was something he had tried to expunge from his memory...他曾努力將那段經(jīng)歷從記憶中抹去。