behind someone's back

US /bɪˈhaɪnd ˈsʌm.wʌnz bæk/
UK /bɪˈhaɪnd ˈsʌm.wʌnz bæk/
"behind someone's back" picture
1.

sau lưng ai đó, mà không cho ai đó biết

without someone's knowledge or without telling them

:
•
I can't believe she talked about me behind my back.
Tôi không thể tin cô ấy lại nói xấu tôi sau lưng.
•
They made the decision behind his back.
Họ đã đưa ra quyết định sau lưng anh ấy.
:
be on someone's backbehindstab someone in the backcover someone's backpat someone on the backsomeone's back is turnedget off someone's back