Adjective knockout has 1 sense
  1. hard, knockout, severe - very strong or vigorous; "strong winds"; "a hard left to the chin"; "a knockout punch"; "a severe blow"
    Antonym: weak (indirect, via strong)
,Noun knockout has 2 senses
  1. smasher, stunner, knockout, beauty, ravisher, sweetheart, peach, lulu, looker, mantrap, dish - a very attractive or seductive looking woman
    --1 is a kind of woman, adult female
  2. knockout, KO - a blow that renders the opponent unconscious
    --2 is a kind of blow
    --2 has particulars: technical knockout, TKO
    Derived form: verb knock out2
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