CEDICT
to blot out; to erase; to discount (past efforts or achievements); to refuse to acknowledge; to obliterate
Wiktionary
勾消、掩滅。如:「一筆抹殺」、「抹殺事實」。也作「抹煞」、「抹摋」。
重編國語辭典
He wishes to erase bad memories.
Source: Tatoeba