a person who is not a police officer but who tries to catch and punish criminals.
Source: Merriam-Webster's Learner's Dictionary. Examples:
Sep 9, 2008
A person who is not a member of law enforcement but who pursues and
punishes persons suspected of lawbreaking. [Spanish, watchman,
Sep 30, 2015
Directed by Trevor L. Smith. With Tanner Andersen, Michael Bethany, Jeremy Burgess, Dameen Dedrick. Tired of being victims, four homeless kids band ...
Mar 28, 2016
Members: Angela Ford, David Jenkins ...