Etymology
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stash (v.)

"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.

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Definitions of stash
1
stash (v.)
save up as for future use;
Synonyms: hoard / cache / lay away / hive up / squirrel away
2
stash (n.)
a secret store of valuables or money;
Synonyms: hoard / cache
From wordnet.princeton.edu