talk of people behind their backs
偷偷地在背后议论 whisper
背后议论人长短 gossip
在背后议论 remark behind sb's back
不要在背后议论别人 don't talk about others behind their backs
别人背后议论，他毫不在意。
He doesn't care at all what people say behind his back.
《新英汉大辞典》
不要在背后议论别人。
Don't talk about others behind their backs.
不说闲话(不传谣言，不在背后议论别人)，不抱怨。
Don't gossip (pass along rumour, or talk about people behind their back) or complain.
youdao
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