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Webster 1913 Edition

Noun.

One who enforces.

Noun.

One who compels, constrains or urges; one who effects by violence; one who carries into effect.

enforcer ‎(plural enforcers)

One who enforces.
The member of a group, especially of a gang, charged with keeping dissident members obedient.
(ice hockey) A player tasked with physically intimidating or confronting the opposition.

one who enforces

member of a group charged with keeping dissident members obedient

ice hockey: player tasked with intimidating or confronting the opposition