an angel believed to protect a particular person, as from danger or error.
a person who looks after or is concerned with the welfare of another.
Origin of guardian angel
First recorded in 1625–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
vigilante volunteers who patrol the underground railway in New York, London, and elsewhere, wearing red berets, to deter violent crime
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012