"to conceal, hide," 1797, criminals' slang, of unknown origin, perhaps a blend of stow and cache. Related: Stashed; stashing.
stash (n.)
"hoard, cache," 1914, from stash (v.). Slang sense of "personal supply of narcotics" is from 1942.
startle
start-up
starvation
starve
starveling
stash
stasis
stat
-stat
state
statecraft