blot out

phrasal verb
1
to cover or hide something completely
پوشاندن, پنهان کردن
2
to deliberately try to forget an unpleasant memory or thought
فراموش کردن, پاک کردن از خاطر, از یاد بردن
He tried to blot out the image of Helen's sad face.
She just wanted to sleep and blot out the terrifying events of the day.