black out

1 to destroy all traces of had spent most of her adulthood trying to black out memories of a wretched childhood Synonyms abolish, annihilate, blot out, cancel, clean (up), efface, eradicate, erase, expunge, exterminate, extirpate, liquidate, obliterate, root (out), rub out, snuff (out), stamp (out), sweep (away), wipe outRelated Words decimate, demolish, destroy, devastate, ravage; dismantle, flatten, mow (down), raze, tear down; ruin, total, waste, wreck; blast, blow up, dash, dynamite, smash; atomize, consume, devour, dissolve, fragment, powder, pulverize, shatter, splinter; doom, finish, kill, kill off, terminate, zap; cancel, cut, discard, ditch, eject, excise, expel, jettison, oust, throw outNear Antonyms conserve, preserve, protect, save; build, construct, create, fabricate, fashion, forge, form, frame, make, manufacture, shape; fix, mend, patch, rebuild, recondition, reconstruct, renew, renovate, repair, restore, revamp

2 to grow dark with the delivery of the knockout punch, the screen blacks out, and in the next scene the boxer wakes up in the hospital Synonyms blacken, darken, close in, duskRelated Words dim, fade, wane; gloom, lower (also lour)Near Antonyms dawn; beam, glow, radiate, shineAntonyms brighten, light, lighten

3 to lose consciousness blacked out after hitting her head on the beam Synonyms faint, conk (out), keel (over), pass out, swoonRelated Words break down, collapse; zonk (out)Antonyms come around, come round, come to, revive