trustbusternoun [ C ]
also trust-buster, trust buster uk/ˈtrʌstˌbʌstər/usinformal LAW, FINANCEa person or organization that works to prevent illegal arrangements between companies:
He was hired as a federal trustbuster by the Justice Department.
trustbusting
noun [ U ] also trust-busting
The extent to which consumers have benefitted from trustbusting is hard to prove.
Several companies were targetted in the government's latest trust-busting exercise.