cut down
phrasal verb with cut verb uk/kʌt/ us/kʌt/ cutting | cut
减少，削减，缩减
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。