The boxer knocked out his opponent in the first round.
knock out
idiomTo strike or render unconscious
A falling branch knocked out the power line, leaving the whole street in darkness.
The anaesthetic swiftly knocked her out, and when she woke, the surgery was already complete.
- 01
don't knock yourself out
Don't overexert yourself (in doing something that does not require much effort).
- 02
knock down a peg
Synonym of take down a notch.
- 03
knock for a loop
To astonish; to stagger or overwhelm; to confuse or disorient.
- 04
knock on heaven's door
To die or be close to death.
- 05
knock on wood
To take a customary action to ward off some misfortune that is believed to be attracted by a presumptuous statement.
- 06
knock oneself out
To go ahead; to do as one pleases; to enjoy oneself; to endeavor very hard at a task.
- 07
knock out of the box
To cause something to be replaced by something else.
- 08
knock some sense into
To reprimand or reform someone vigorously.