The children jumped up and down to keep warm.

孩子们上下跳动保持身体暖和。

《牛津词典》

She walked up and down, flapping her arms to keep warm.

她来回走动，挥动着双臂使身体暖和起来。

《牛津词典》

For cooler (blue or green) light, you'll tell the camera to warm things up, and in warm light, you'll tell it to cool down.

对于较冷的光源（蓝或绿色），你会让相机给照片增加暖色，而在暖光源下，你要让它给照片降温。

youdao

To dry parsley, tie the plant stems together and hang them upside down in a warm, dark,airy place.

VOA: special.2009.06.02

You take fuel, rather you take something that's warm, and you put it in contact with the atmosphere, it cools down.

改变约束,继续加热,气体膨胀。

麻省理工公开课 - 热力学与动力学课程节选

They also should "warm down" afterward by reducing speed or exertion before stopping completely.

WSJ: Kids With Asthma Play Hard, Too

At the end we did a warm down which turned into a small lap of honour and it was great to see a small knot of Scottish fans in the crowd.

BBC: John Barclay's view

Aussies seemed to warm to his down-to-earth style and he was thought to have had such a good time that it fuelled speculation that he might end up honeymooning in Australia.

BBC: Why republican Australia warms to Prince William