CEDICT
to blot out; to erase; to discount (past efforts or achievements); to refuse to acknowledge; to obliterate
Wiktionary
勾消、掩灭。如:「一笔抹杀」、「抹杀事实」。也作「抹煞」、「抹摋」。
重編國語辭典
He wishes to erase bad memories.
Source: Tatoeba