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English definition of “strongbox”

strongbox

noun [C] uk   /ˈstrɒŋ.bɒks/ us    /ˈstrɑːŋ.bɑːks/ mainly US
a specially made box that is fastened with a lock and is very difficult to break, used to keep valuable objects safe
(Definition of strongbox from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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