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

1.
배신하다, 뒤통수를 치다
to betray someone, especially a friend or someone who trusts you
:
•
I can't believe she would stab me in the back like that after all we've been through.
우리가 겪은 모든 일 후에 그녀가 그렇게 나를 배신할 줄은 믿을 수 없어.
•
He felt completely betrayed when his business partner stabbed him in the back.
사업 파트너가 그를 배신했을 때 그는 완전히 배신감을 느꼈다.