Definition & Meaning of "[stick|stand] out like a sore thumb"

What is the origin of the idiom "stick out like a sore thumb" and when to use it?

The idiom "stick out like a sore thumb" has its origin in the concept of visual prominence and discomfort. The phrase signifies something or someone that is highly conspicuous, noticeable, or distinct in a way that draws immediate attention, often in a negative or uncomfortable manner. This expression is commonly used to describe situations where an individual or object is markedly different, out of place, or easily identified due to its stark contrast with the surrounding environment or context.