تعريف ومعنى "a mile away"

What is the origin of the idiom "a mile away" and when to use it?

The idiom "a mile away" has its origin in the concept of distance and perception. The phrase signifies the ability to perceive or detect something from a significant distance due to its obviousness, distinct characteristics, or conspicuous nature. It is used to suggests that the observation or recognition of a particular quality, behavior, or intention is so evident that it can be anticipated or noticed well in advance.