ice

1 to make sure, certain, or safe with that win, the team has pretty much iced a spot in the play-offs Synonyms assure, cinch, guarantee, guaranty, ensure, insure, secureRelated Words attest, certify, vouch, warrant, witness; pledge, promise, swearNear Antonyms enfeeble, undermine, weaken

2 slang  to put to death deliberately that gang leader wouldn't hesitate to ice anyone who tries to invade his turf Synonyms assassinate, bump off, croak [slang], dispatch, do in, execute, get, murder [slang], knock off, liquidate, neutralize, off [slang], put away, rub out, slay, snuff, take out, terminate, whack [slang]Related Words blow away, shoot, shoot down; blot out, carry off, claim, cut down, destroy, fell, kill, smite, zap; butcher, massacre, mow (down), slaughter; annihilate, eliminate, eradicate, exterminate, wipe outNear Antonyms animate, raise, restore, resurrect, resuscitate, revive