What is the origin of the idiom "think on one's feet" and when to use it?

The idiom "think on one's feet" is derived from the idea of someone quickly and effectively making decisions or solving problems in a dynamic and fast-paced situation, such as in a conversation, presentation, or an unexpected challenge. It is often used to describe the ability to respond rapidly and adapt to changing circumstances without much preparation. This idiom highlights a person's skill in making smart, immediate decisions.