guardian angel

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

Very rich, very generous, and very easily “taken in,” he was the guardian-angel of all the poor in the neighborhood.

The Gypsy Queen's Vow |May Agnes Fleming
"Her spiritual partner and guardian-angel," explained Miss Turligood,—and this for my satisfaction as the last-comer.

The Atlantic Monthly, Volume 13, No. 80, June, 1864 |Various
And so each one has his devil to exorcise and his guardian-angel to watch over him.

A Novelist on Novels |W. L. George
You have called me, too, your guardian-angel; Oh suffer me to call you mine!

The Wanderer (Volume 4 of 5) |Fanny Burney

The population of Pillau venerate her as something holy, and the seamen look upon her as their guardian-angel.

Gems Gathered in Haste |Anonymous