strongbox

[ strawng-boks, strong- ]

/ ˈstrɔŋˌbɒks, ˈstrɒŋ- /

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

"They" had not thought that this little dwelling-place was a strongbox and that it had flat bolts, both vertical and horizontal.

Our Part in the Great War |Arthur Gleason
Amazed by the boldness of his former employee, Mr. Parker immediately examined the contents of both his desk and strongbox.

Ghost Beyond the Gate |Mildred A. Wirt
So he kept it in his strongbox, where he thought it safe from prying eyes.

Richard Carvel, Complete |Winston Churchill
As for the Landgrave, there was a cool million in bullion in his strongbox.

Little Journeys to the Homes of the Great, Volume 11 (of 14) |Elbert Hubbard

Checks confirm no bank accounts so a strongbox is suspected.

The Land of Look Behind |Paul Cameron Brown

strongbox

/ (ˈstrɒŋˌbɒks) /

a specially designed box or safe in which valuables are locked for safety