Knight in shining armor

Knight in shining armor is an idiom that has been in use since the turn of the 20th century. An idiom is a commonly used word, group of words, or phrase that has a figurative meaning that is not easily deduced from its literal definition. Often using descriptive imagery or metaphors, common idioms are words […]
from Grammarist
https://grammarist.com/idiom/knight-in-shining-armor/