cut down phr v 1 [I,T cut sth ↔ down] to reduce the amount of something you do or use 减少: I'm trying to cut down on my drinking. 我正在尽量少喝酒。 2 [T cut sth ↔ down] to cut a tree so that it all falls to the ground 砍倒〔树木〕: All the beautiful old oaks had been cut down to build houses. 所有漂亮的老橡树都已被砍倒用来造房子。