Definition
To try to persuade or convince someone about something to an extreme degree, but with no success; to talk in vain.
磨破嘴皮（但沒有用）
I argued with her until I was blue in the face, but she still wouldn't believe me.
我和她爭辯到口沫橫飛，但她還是不相信我。
You can argue with the boss until you are blue in the face, but he won't give you a raise.
你可以和老闆爭辯到口沫橫飛，但他不會給你加薪。
He explained to her until he was blue in the face, but she still didn't understand.
他向她解釋到口沫橫飛，但她還是不明白。