(electricity) An electrical switch capable of opening and closing an electrical circuit in all operating conditions, including fault situations.

(idiomatic) An issue which causes a relationship (especially in business) to fail.

Alternative spelling of heartbreaker

(automotive) A tool or device used to separate the bead from a tire rim.

plural of circuit breaker

plural of ball-breaker

Alternative spelling of leg-breaker

(chiefly US, slang) A violent thug, especially one employed as an enforcer by a criminal organization. / A person whose job is to break the legs of poultry in a food processing facility.

Alternative spelling of circuit breaker

a place where old or accident-damaged vehicles are broken up; a wreck yard