talk behind someone's back

پیشنهاد کاربران

پشت سر کسی حرف زدن
Used to say that someone intentionally says or does something when another person is not there and cannot know about it
BEHIND SOMEONE'S BACK - Cambridge Dictionary
She went behind his back and spoke directly to his supervisor.
Merriam - Webster Dictionary
پشت سر کسی حرف زدن - غیبت کردن

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