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strongbox

noun [C]
 
/ˈstrɒŋ.bɒks/ US  /ˈstrɑːŋ.bɑːks/ mainly US

Definition

a specially made box that is fastened with a lock and is very difficult to break, used to keep valuable objects safeGeneral and miscellaneous containers
(Definition of strongbox noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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