stash1 / stash/ inf. • v. [tr.] store (something) safely and secretly in a specified place: their wealth had been stashed away in Swiss banks.• n. 1. a secret store of something: the man grudgingly handed over a stash of notes. ∎ a quantity of an illegal drug, esp. one kept for personal use: one prisoner tried to swallow his stash.2. dated a hiding place or hideout.stash2 • n. inf. a mustache.