stash (n.) Look up stash at Dictionary.com
"hoard, cache," 1914, from stash (v.). Slang sense of "personal supply of narcotics" is from 1942.
stash (v.) Look up stash at Dictionary.com
"to conceal, hide," 1797, criminals' slang, of unknown origin, perhaps a blend of stow and cache. Related: Stashed; stashing.