1.Ra good spirit who is believed to protect a person or place 〔某人或某地的〕守护天使
2.PROTECTsomeone who helps or protects someone else when they are in trouble 帮助[保护]他人的好人
Examples from the Corpus
guardian angel• Perhaps you have a guardian angel.• The knowledge of an empiricist's guardian angel would presumably be neither embodied nor built in.• The soul was accessible to the gaze of your guardian angel.