Definition & Meaning of "cut off one's nose to spite one's face"

What is the origin of the idiom "cut off one's nose to spite one's face" and when to use it?

The idiom "cut off one's nose to spite one's face" has its origins in the ancient practice of self-mutilation as a form of revenge or protest. Figuratively, it refers to an act of self-destructive behavior or decision-making motivated by a desire to harm someone else, often resulting in unintended consequences that ultimately harm oneself.