badmouth

You're a real nitwit. Why should you Badmouth his girlfriend in his face?

你真是个糊涂虫, 怎么能当他面说他女朋友的 呢 ?

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Who do you think you are that you can badmouth me like that behind my back.

你以为你是谁,能那样在我背后说我坏话?

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