What is the origin of the idiom "sharp tongue" and when to use it?

The idiom "sharp tongue" originates from the metaphorical use of the word "sharp" to describe someone's critical, witty, or acerbic way of speaking. The term emphasizes the cutting or incisive nature of the person's words, suggesting that their language is pointed and can be piercingly critical. It is often used to describe individuals who possess a talent for delivering clever, biting remarks or criticisms.