Synonyms for Blot out:

n.

submerge, camouflage, tuck away, lie low. repress, forget, escape, put something behind you, slip your mind/memory, lose sight of, blank out. deface, delete, cross out. eclipse, shade, darken. blot out (noun)
obliterate, obscure, hide.

v.

annihilate (verb)
obliterate.
annul (verb)
delete.
cancel (verb)
deface, cross out.
change (verb)
obliterate, obscure, hide.
eclipse (verb)
darken.
extinguish (verb)
obscure.

Other synonyms:

submerge. forget, blank out. tuck away. camouflage. escape. destroy
obliterate.