Sarah feels the breath knocked out of her by the impact.

I landed on my back, the breath knocked out of me by the impact.

He'd had the wind knocked out of him by Lawrence's death.

"This thing will go about 100 miles on a full charge, but if you use the heater you'll knock that down by maybe 40 percent."

I went with him once, and we knocked them on the head by the score.

They can knock a man down by sheer force of will.

But two men had the wind momentarily knocked out of them by the impact.

They also may knock over elderly people or children by accident.

There was almost no surf now, the sea knocked flat by the wind.

It could have gotten knocked out of the sky by something.