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
British Dictionary definitions for guardian angels
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