Other forms: stashed; stashing; stashes
When you stash something, you stow it away to use it later. Your little brother might stash his Halloween candy under his bed, for example.
Use the word stash as a verb that means "hoard" or "stockpile," or as a noun — a pirate's secret pile of gold doubloons can be called a stash, and so can the collection of overdue library books you've got piled beside your bed. The verb version of stash was originally a late 1700's criminals' slang word meaning "conceal." It may have come from a combination of stow and cache.