Synonyms for Block out:

n.

escape, obliterate, blot out, forget, lose sight of, erase, blank out, put something behind you, slip your mind/memory, repress. dim, shade, darken, extinguish, cut out, overshadow, shadow. hide, conceal, cover. outline, sketch, chart, plan. block out (noun)
mask, screen.

v.

contact (verb)
mask, screen.
plan course (verb)
sketch, chart, outline.
try to forget (verb)
cover, screen, conceal, hide.

Other synonyms:

darken. extinguish, overshadow. shadow. cut out. dim, shade. Other relevant words:
conceal, outline, chart, cover, sketch, hide, plan.