In the sport of boxing, a knockout is a blow that sends one of the boxers to the mat, unable to continue fighting. If you are down and can't rise before the ref counts to ten, consider it a knockout.

In full-contact fighting sports, including boxing, karate, and kickboxing, the ultimate goal is a match-winning knockout of the opponent. Not all boxing matches end this way, but a knockout is the most exciting (and dangerous) way for a match to end. This word is also used to mean "gorgeous person," so if someone tells you you're a knockout, you can be sure they mean it as a compliment.

Definitions of knockout
  1. noun
    a blow that renders the opponent unconscious
    synonyms: KO, kayo
    see moresee less
    TKO, technical knockout
    a knockout declared by the referee who judges one boxer unable to continue
    type of:
    blow, buffet
    a powerful stroke with the fist or a weapon
  2. adjective
    very strong or vigorous
    “a knockout punch”
    synonyms: hard, severe
    having strength or power greater than average or expected
  3. noun
    a very attractive woman
    synonyms: beauty, dish, looker, lulu, mantrap, peach, ravisher, smasher, stunner, sweetheart
    see moresee less
    type of:
    adult female, woman
    an adult female person (as opposed to a man)
Word Family

Test prep from the experts

Boost your test score with programs developed by’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.


  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week


  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week


  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week