A person or group that ensures compliance with laws, rules, or regulations. The enforcer was responsible for making sure that all the club's rules were followed.
A person who imposes their will on others, often through the use of force or intimidation. The gang's enforcer was feared throughout the neighborhood for his ruthless tactics.
A hardware device, mechanism, or software component that ensures a rule or policy is followed. The firewall acted as a policy enforcer, blocking all unauthorized connections.
In ice hockey and other contact sports, a player whose role is to deter or respond to rough play, often through physical confrontation. The team's enforcer dropped his gloves to protect the star forward.