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

There has been no painful attack like the ransomware we saw knock out M&S and JLR in 2025.

From BBC ● Oct. 22, 2026

“If you knock out a few sets of pull-ups or biceps curls, you see your muscles popping in a way that is much harder to achieve if you squat.”

From The Wall Street Journal ● Oct. 2, 2026

"The evidence -- that you can knock out PRX3 in mice and there's no adverse phenotype -- supports our approach."

From Science Daily ● Sep. 17, 2026

These are days when you knock out a bunch of important personal tasks that you’ve been putting off, like scheduling key appointments, going for your annual physical and paying your bills.

From MarketWatch ● Jun. 30, 2026

He pointed to the loudmouthed thief that Celaena wanted to knock out cold.

From "Throne of Glass" by Sarah J. Maas

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