Longman Dictionary of Contemporary English homepage

knockout

1 noun
     
Related topics: Other Sports
knock‧out1 [countable]
1DSO when a boxer hits his opponent so hard that he falls down and cannot get up again:
The fight ended in a knockout.
2 informal someone or something that is very attractive or successful:
Her dress was a knockout.
3 a type of competition in which only the winning players or teams at each stage continue to play until there is only one winner
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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