stab someone in the back

US /stæb ˈsʌm.wʌn ɪn ðə bæk/
UK /stæb ˈsʌm.wʌn ɪn ðə bæk/
"stab someone in the back" picture
1.

to betray someone, especially a friend or someone who trusts you

:
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I can't believe she would stab me in the back like that after all we've been through.
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He felt completely betrayed when his business partner stabbed him in the back.
:
stabbe on someone's backpat someone on the backsomeone's back is turnedbehind someone's backcover someone's backhave a stab at