blot something out
phrasal verb with blot verb [ T ] uk/blɒt/ us/blɑːt/ -tt-
(SUN)
遮蔽（尤指阳光）
to hide or block the light from something, especially the sun
A dark cloud suddenly blotted out the sun. 一团乌云突然遮住了太阳。
(MEMORY)
忘却，抹掉（不快的记忆）
to stop yourself thinking about something unpleasant
Perhaps there are some memories so bad that you have to blot them out. 也许有些记忆很痛苦，你不得不把它们忘掉。