Stash (n): A knitter's supply of yarn, conveniently prepurchased and placed in the home of the knitter. Oddly, many knitters do not knit from their stash but continue to purchase as they go, despite the presence of what is essentially a personalized yarn shop where they don't have to pay. This phenomenon has led researchers (OK: me) to believe that stashes exist not just for the purposes of knitting but for inspiration. After all, painters have lots of paint.
Stephanie Pearl-McPhee, aka The Yarn Harlot