恨不得

恨不得

Literally means:

be itching to

Actually means:

be anxious to

It refers to the eagerness to do something or the wish to see a certain situation occur. Since such wishes usually cannot be realized, it implies a sense of regret.

迫切希望能够做成某事或能够出现某种情况。由于事实上愿望是不能实现的，因而含有遗憾的意味。