blot1 past tense and past participle blotted, present participle blotting [transitive]
to make a wet surface become dry by pressing soft paper or cloth on it
2 British English informal
to do something that spoils the idea that people have of you
blot something ↔ outphrasal verb
to cover or hide something completely:
Thick white smoke blotted out the sun.
if you blot out an unpleasant memory, a thought etc, you deliberately try to forget it:
She said she took drugs to blot out her problems.