A : I thought we had this deal.
I can't believe they just truned around and went with another company!
B : What?
A : I got stabbed in the back.
B : I warned you. I told you that you can't trust them.
stab (날카로운 물체나 칼 같은 것으로) 찌르다
have a deal 계약이 성사되다, 잘 해결되다