Noun
deal breaker (plural deal breakers)
An issue which causes a relationship (especially in business) to fail.
deal-breaker
Infidelity is a deal breaker for me. I've broken up with people over it. You can't do monogamy 90 percent of the time. Alanis Morissette
I don't think God cares if I wear nail polish or not. I don't think that's a deal breaker for him. Sofia Vergara