Home › Words › S › strongboxstrongboxstrongbox means A sturdy box with a lock, for storing valuables.Among words judged in Lexicurio's Arena, strongbox ranks #7,708 of 42,747 for Qualifying.EtymologyFrom strong + box. Compare French coffre-fort.nounA sturdy box with a lock, for storing valuables.e.g.“Near-synonyms: safe-deposit box, safe deposit box, safety-deposit box”Definitions & examples from Wiktionary (CC BY-SA 3.0).