cut under

例句：

1. 1.She cut the cake into small pieces for the party.
   她把蛋糕切成小块，为聚会做准备。
2. 2.The car was cut under by a tree.
   汽车被一棵树撞断了。
3. 3. The old man cut under his beard to shave.
   老人剃掉了胡须。