cut down on 削减，减少;节省;减轻

【例句】
When big City firms cut down on their entertainments, we shall know that times really are hard.
当伦敦商业区的大公司削减他们的娱乐活动开支，我们就知道世道真的变得艰难了。

You should cut down on fats and carbohydrates.
你应该减少摄入脂肪和碳水化合物。