knock out

Idioms  

1. Also, knock out cold . Render unconscious by a blow or some other means. For example, It was just a swinging door, but it knocked her out , or Just one of those sleeping pills can knock you out cold . [Late 1500s]

2. Make tired, exhaust, as in That sightseeing tour knocked me out .

3. Render useless or inoperative, as in The storm knocked out the power .

4. See knock off , def. 2.

5. See knock oneself out .

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Example Sentences

See Examples For:

knock out

In 1993 it was home to the largest crowd in championship boxing history, when 132,274 people watched national hero Julio Cesar Chavez knock out Greg Hauger to retain the WBC super lightweight title.

From BBC ● Jul. 5, 2026

And yes, your day-to-day might feel more strained while you’re trying to knock out this last $20,000 — but I promise that you’ll feel much lighter entering your 41st birthday with no debt.

From MarketWatch ● Jun. 30, 2026

Particularly fierce solar storms can knock out satellites and threaten astronauts -- and create dazzling auroras in the skies known as the northern or southern lights.

From Barron's ● May 19, 2026

Nor does the Minnesota Wild defenseman hit the hardest or knock out the most teeth.

From The Wall Street Journal ● May 3, 2026

But I don't even do Maddy's that tight, and I can knock out a whole head full of hair in half an hour if she sits still.

From "Patina" by Jason Reynolds