cut up ,cut out,cut off, cut down的区别是什么？

cut up 切碎, 切割开；
cut in 插嘴, 打断；
cut off 切〔隔〕断；
cut down 把…砍倒〔割掉〕 减少, 降低；

cut用作动词 (v.)

• This knife is not sharp enough to cut the steak.
  这把刀子不够利,无法切牛排。

• Don't cut your finger on the broken glass.
  别让碎玻璃割伤你的手。

• Face round, please, so that I can cut your hair at the back.
  转一下头, 好让我可以剪你后面的头发。

• Please cut out the expense in order to save the money.
  为了节省钱,请削减开支。

• His cruel remarks cut me deeply.
  他那无情的话太伤我的心了。

• He insisted that we give him the last cut before every deal.
  他坚持让我们在每次发牌前都让他来最后切牌。

• The fate of the game will be decided in the final cut of the cards.
  这局牌的命运将由最后的切牌决定。

cut用作名词 (n.)

• His cheek was badly scarred by a knife cut.
  他的面颊上留有严重的刀疤。

• He had a finger cut off by a machine while working.
  他在工作时被机器切掉了一个手指。