Meaning of “blot sth out” - Learner’s Dictionary

blot sth out

phrasal verb with blot uk us /blɒt/ verb [ T ] (present participle blotting, past tense and past participle blotted)
NOT THINK

to stop yourself from thinking about something unpleasant:

I've tried to blot out memories of my relationship with Dieter.
CANNOT SEE

If smoke or cloud blots out the sun, it prevents it from being seen.

(Definition of “blot sth out” from the Cambridge Learner’s Dictionary © Cambridge University Press)