Literal Origin:
* Cork: This refers to the bark of the cork oak tree, which is used to create stoppers for bottles.
* Corker: A corker was a tool used to insert and remove corks from bottles.
Figurative Evolution:
* Excellent Example: The phrase "a corker" was likely used to describe a particularly good bottle of wine, one with a tight cork that ensured its quality. This was because a good cork indicated a good wine.
* Metaphorical Extension: Over time, the term "corker" evolved to describe anything exceptional or outstanding, regardless of its connection to wine or corks.
Therefore, the term "corker" is a metaphorical extension of its literal origins. It originally described a well-sealed wine bottle, signifying quality, and later evolved to describe anything exceptional, much like a cork that perfectly seals a fine vintage.