(1):
(v. t.) To make sharp, keen, or eager; to excite; to stimulate; as, to whet the appetite or the courage.
(2):
(v. t.) To rub or on with some substance, as a piece of stone, for the purpose of sharpening; to sharpen by attrition; as, to whet a knife.
(3):
(n.) The act of whetting.
(4):
(n.) That which whets or sharpens; esp., an appetizer.