螳臂挡车

to kick against the pricks

鞠躬尽瘁 

to give the last measure of devotion

聪明反被聪明误

to suffer for one's wisdom

旧调重谈

to harp on the same string

礼尚往来

Courtesy on one side cannot last long..

礼多必诈   

full of courtesy, full of craft

声嘶力竭

He was talking at the top of his voice.

覆水难收

What's done cannot be undone./There is no use crying over spiltmilk.

转石不生苔

A rolling stone gathers no moss.

转败为胜

to convert defeat into victory

鞭长莫及

beyond one's grasp

关公门前耍大刀

There's no need to teach a fish to swim.

严以责己宽以待人

to be severe with oneself and lenient with others

铁石心肠

a heart of steel

听天由命

to be guided by destiny

骄兵必败

 Pride goes before a fall.