What is the origin of the idiom "faint of heart" and when to use it?

The phrase "faint of heart" has its origins in the Middle Ages and Renaissance era. It refers to individuals who are easily frightened or lack the courage to face challenging or potentially distressing situations. The word "faint" in this context means weak or lacking in strength, and "heart" symbolizes bravery or fortitude. It is used to describe people who are easily frightened, timid, or lacking in courage when confronted with difficult or intense circumstances. It suggests that such individuals have a weak or fragile disposition that makes them susceptible to fear or discomfort.