What action is described by the verb "whet"?

The verb "whet" refers to the action of sharpening or making something keen, particularly in relation to an edge or appetite. When we use the term, it often implies enhancing or intensifying a quality, especially in the context of sharpening a blade or stimulating interest or desire. For example, one might "whet" their appetite by discussing delicious food, or a knife can be "whet" to improve its cutting ability. This usage highlights the idea of improvement or enhancement, which is fundamental to the meaning of the word.

In contrast, options suggesting dulling, erasing, or ignoring do not align with the definition of "whet," as they convey actions that diminish or negate qualities rather than enhance them. Thus, the correct answer accurately captures the essence of the word.