Definition & Meaning of "fight shy of something "

What is the origin of the idiom "fight shy of something" and when to use it?

The idiom "fight shy of something" has uncertain origins but is thought to have evolved from the word "shy," which originally meant to startle or avoid. Over time, it has come to represent a sense of reluctance or hesitancy, often related to aversion or avoidance of something due to fear, suspicion, or apprehension. The idiom emphasizes a strong inclination to steer clear of a particular issue, subject, or situation.