hwettan

Old English hwettan meant 'to sharpen,' from the Proto-Germanic *hwatjan, related to hwæt, 'sharp' or 'bold.' The word described the physical act of dragging a blade across a whetstone — a fine-grained stone used to hone edges. The whetstone (hwæt + stan) was one of the most important tools in any Anglo-Saxon household. A dull blade was a danger. A sharp one was survival.

The figurative meaning — to whet the appetite, to whet curiosity, to whet desire — appeared in English by the early 16th century. The metaphor was direct: just as a stone sharpens a blade's edge, a small taste sharpens hunger for more. Shakespeare used it: 'To whet my appetite' appears in his work, and the expression was already common by his time. The jump from physical sharpening to mental sharpening required no explanation.

Whet is frequently confused with 'wet.' The spellings diverged centuries ago — whet from hwettan (to sharpen), wet from wæt (moist) — but the homophones collide in the phrase 'whet your appetite,' which many people write as 'wet your appetite.' The error is understandable. Both make a kind of sense: sharpening your hunger and moistening your mouth are both things that happen before eating. But the correct word is whet. The appetite is being sharpened, not dampened.

Modern English uses whet almost exclusively in the phrase 'whet the appetite.' The literal sense — sharpening a blade — has been replaced by 'sharpen' and 'hone.' Whetstones still exist, sold in hardware stores and kitchen supply shops, but the word 'whet' on its own sounds archaic. It has survived in one idiom while dying everywhere else. The stone outlasted the verb that named it.