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Military OriginPlay
Originally used for places storing military items, 'arsenal' keeps this strong association. SlideThe ancient arsenal contained cannons and swords.
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Not For WeaponsPlay
'Arsenal' isn't used for places that just sell weapons, like gun shops. SlideHe mistakenly called the gun shop an arsenal.
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Security ImplicationsPlay
An 'arsenal' often implies a secure, controlled facility due to the dangerous items stored. SlideThe military arsenal was guarded 24/7.