the.com/stash

A hiding spot for things you'll swear you never had.

means To hide something away for safekeeping or secrecy, or the hidden stockpile itself.

from Origin murky — it surfaces in English around the 1700s, possibly a blend of 'store' and 'cache,' though etymologists shrug at that too. By the 20th century it had picked up its outlaw shine, becoming the word of choice for drug caches and squirreled-away cash, which is the whiff it still carries today.

origin
18th century sailor slang for secret storage
etymology guess
possibly blend of store and cache
modern use
doubles as noun for secret weed supply
psychology
hidden things feel more valuable just by hiding
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