to do or use less of something

I'm trying to cut down on caffeine. 我在努力减少咖啡因的摄入量。

She used to work 50 hours a week, but recently she's cut down. 她曾经一个星期工作50个小时，但是近来减少了。

to reduce the number, amount, or size of something

Patients were asked if they had cut down their use of painkillers. 病人们被问及是否减少了止痛片的服用量。

I need to cut this section down to 500 words. 我需要把这一部分删减到500字。

to make a tree or other plant fall to the ground by cutting it near the bottom

They are cutting down forests to clear land for cattle. 他们正在砍伐森林，腾出地方来养牛。