whet somebody's appetite

whet (one's) appetite

To induce or increase one's interest in something. The first chapter of that novel really whetted my appetite—I'm eager to read more of it tonight.
See also: appetite, whet

ˌwhet somebody’s ˈappetite

make somebody feel hungry; make somebody interested in something: Don’t eat too much of this dish. It’s only to whet your appetite for the main course.One of my teachers lent me a book about climbing, and it really whetted my appetite.
If you whet a knife, sword, etc., you make it sharper.
See also: appetite, whet