guardian angel 
noun
A spirit that is thought to watch over and protect a person or place: the soul was accessible to the gaze of your guardian angel figurative he was also deputed to be Dame Edith’s guardian angel...
- His guardian angel must have been watching over him.
- It was as if I had a guardian angel watching over me.
- Well you can find classes on how to talk to your dead pets, how to identify your guardian angel, how to bend spoons…
- under the cosh
- under the counter (or table)
- under the gun
- under (the) hatches
- under the heel of
- under the impression that
- under the influence
- under the microscope
- under the name (of)
- under the open sky
- under the pump
- under the rose
- under the skin
- under the sod
- under the sun
- under the table
- under the weather
- under the wire
- underthings
- underthrust
- undertint
- undertip
- undertone
- undertook
- undertow