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To secrete, hoard, or store something away so as to avoid discovery by others or to preserve or amass for future use. A noun or pronoun can be used between "stash" and "away." Please, you have to stash these drugs away for me. The cops won't look in your house! My wife stashes chocolates away in the back of the cupboard like she's trying to hide them from me or something. My grandmother stashed away a bit of money every week under her mattress until she and my grandfather retired.
stash something away
to hide something; to set something aside for use at a later time. Please stash this away somewhere. You may need it someday. You should stash away some money for later.