talk till you’re blue in the face 费尽唇舌；嘴巴说干了都没用

【例句】
You can argue till you're blue in the face, but you won't change my mind.
你可以费尽唇舌，但改变不了我的主意。

I talked to him until I was blue in the face, but he wouldn't listen to me.
我和他谈话谈得面红耳赤，可是他还是不听我的。