undo

vt.解开,松开v.取消 撤消

撤销；解开；取消。

动词；

1、I accidentally deleted the file, but luckily I was able to undo it.
我不小心删除了那个文件，但幸运的是我能够撤销。
2、Once the damage is done, it's difficult to undo the consequences.
一旦造成了损害，要想消除后果是很困难的。