It’s no wonder that many people misspell the phrase “whet your appetite.” After all, your mouth waters when your appetite is stirred, so why wouldn’t the phrase be spelled as “wet your appetite”?
In its most literal sense, “whet” means to sharpen like you would a knife or blade. When used in the phrase “whet your appetite,” it means to arouse interest or eagerness, to metaphorically sharpen your appetite.