Synonyms for Black out:

n.

active duty, active service, bombed-out, air cover, battle cry, aggressor, belligerent, Beleaguered. collapse, slump, go under, knock out, fit, stun. tuck away, hide, cover, erase, obliterate, mask, cancel, obscure, rub out, submerge, censor, camouflage, conceal, lie low, eradicate. batten, shade, eclipse. black out (noun)
blacken out, zonk out, pass out.

v.

faint (verb)
collapse.
lose consciousness (verb)
zonk out, batten, eclipse, rub out, pass out, conceal, shade, erase, eradicate.

Other synonyms:

aggressor, belligerent, Beleaguered, bombed-out, cancel, active service, active duty. go under, air cover. censor. collapse, slump. knock out. fit. destroy
obliterate.
Other relevant words:
eradicate, erase, cancel, eclipse, collapse, censor, conceal, obscure, shade, obliterate, rub out, batten.