out
1.
to cover or hide sth completely :
Clouds blotted out the sun.
2.
to deliberately try to forget an unpleasant memory or thought :
He tried to blot out the image of Helen's sad face.
out
1.
to cover or hide sth completely :
Clouds blotted out the sun.
2.
to deliberately try to forget an unpleasant memory or thought :
He tried to blot out the image of Helen's sad face.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005