To stash means to hide something away in a safe or secret place, usually for later use. You might stash your Halloween candy in your desk drawer so your siblings won't find it, or stash your allowance in a piggy bank until you've saved enough for something special. Pirates in stories famously stashed their treasure on remote islands, burying it where no one else could discover it.

The word suggests both hiding and saving. When you stash something, you're tucking it somewhere others won't easily spot it, keeping it concealed until you need it. A squirrel stashes acorns for winter, hiding them in tree holes and underground. A spy might stash secret documents in a hidden compartment.

As a noun, a stash is the hidden collection itself. You might have a stash of art supplies under your bed, or discover your dad's stash of old comic books in the attic. The word often implies something valuable or desirable that's worth keeping safe and out of sight.