strongbox

[ strawng-boks, strong- ]
/ ˈstrɔŋˌbɒks, ˈstrɒŋ- /

noun

a strongly made, lockable box or chest for safeguarding valuable possessions, as money, jewels, or documents.

Origin of strongbox

First recorded in 1675–85; strong + box1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for strongbox

strongbox
/ (ˈstrɒŋˌbɒks) /

noun

a specially designed box or safe in which valuables are locked for safety
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012