whet someone'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.
whet someone's appetite
COMMON If something whets your appetite for a particular thing, it makes you want it. Winning the World Championship should have whetted his appetite for more success. Her appetite already whetted by the book, she took a trip to England. Note: You can also say that something whets the appetite. The series is entertaining, and it certainly whets the appetite. Note: To whet a knife means to sharpen it.