What is the origin of the idiom "on one's heels" and when to use it?
The origin of the idiom "on one's heels" can be traced back to the literal interpretation of the word "heels" as the back part of the foot. Historically, it referred to the act of someone following closely behind another person, much like a person following in the footsteps of the one in front. This phrase is used in various contexts or occasions to describe a situation where someone feels constantly pursued, monitored, or bothered by another person or entity. It can refer to both physical and metaphorical instances of being closely followed or hounded.