1. A blow that renders the opponent unconscious
   "The boxer won by knockout in the third round"; "He scored a knockout with a powerful right hook";
   - KO, kayo [informal]
    
2. [informal] An outstanding example of its kind
   "his roses were knockouts";
   - beauty, beaut [informal], cracker [Brit, informal], lulu [informal], killer [informal], blinder [Brit, informal]
    
3. [informal] A very attractive or seductive looking woman
   "He couldn't take his eyes off the knockout who had just walked into the room";
   - smasher [Brit, informal], stunner [informal], beauty, ravisher, peach [informal], lulu [informal], looker [informal], mantrap [informal], dish [Brit, informal], patootie [US, informal], fox [informal], hottie [informal], hotty [informal], babe [informal], honey [informal]

1. Very strong or vigorous
   "a knockout punch";
   - hard, severe

1. Knock unconscious or senseless
   "the boxing champion knocked out his opponent in a few seconds";
   - knock cold, kayo [informal]
    
2. Eliminate
   "knock out a target"
    
3. Destroy or break forcefully
   "The windows were knocked out"
    
4. Overwhelm with admiration
   "All the guys were knocked out by her charm"
    
5. Empty (as of tobacco) by knocking out
   "knocked out a pipe"

1. A contest of several rounds in which the loser in each round is eliminated
   "The team advanced to the next round of the knock out tournament"

Derived forms: knocking out, knocked out, knocks out, knockouts

See also: knock, strong

Type of: adult female, beat, beat up, blow, do away with, eliminate, empty, engulf, example, exemplar, extinguish, get rid of, good example, ingulf [archaic], model, overcome, overpower, overtake, overwhelm, remove, sweep over, take, take away, withdraw, woman, work over [informal]

Encyclopedia: Knockout