knockout是什么意思？

In boxing, a knockout is a situation in which a boxer wins the fight by making his opponent fall to the ground and be unable to stand up before the referee has counted to ten.

A knockout blow is an action or event that completely defeats an opponent.

A knockout competition is one in which the players or teams that win continue playing until there is only one winner left.

If you describe someone or something as a knockout, you think that they are extremely attractive or impressive.