Definition of "enforcer"

One who enforces.  examples

A hired strongman, especially working for the underworld.  quotations  examples

The member of a group, especially of a gang, charged with keeping dissident members obedient.  examples

(UK) A battering ram used by the emergency services for gaining access to locked premises.  examples

(ice hockey, rugby, Australian rules football) A player who physically intimidates or confronts the opposition.  examples