stop at nothing: to be willing to do anything to get what you want, even if it is dishonest or wrong 不择手段,毫无顾忌
He'd stop at nothing to make a success out of his business.
stop short of something/of doing something: 突然停住,差一点儿没做某事;险些做出某事 nearly but not actually do sth, for example because you are afraid or you think it is a bad idea
She stopped short of calling the president a liar.
The manager told her that he was unhappy with her work, but he stopped short of dismissing her from her job.
bite/snap somebody's head off :to shout at somebody in an angry way, especially without reason 气愤地对某人大喊大叫;(尤指毫无道理地)呵斥某人
He was only making a suggestion---there's no need to snap his head off!
The teacher must be having a bad day. I only asked her a question and she bit my head off.
bury/hide your head in the sand:to refuse to admit that a problem exists or refuse to deal with it 采取鸵鸟政策;不正视现实;回避问题
Stop burying your head in the sand, Tim. Don't pretend that everything's all right.