Equipped with weapons or having weapons available. Can also mean having defensive or protective equipment.
From Old French 'armer' meaning to equip with weapons, from Latin 'armare' derived from 'arma' meaning weapons or tools. The meaning expanded from weapons to any kind of equipment.
The word 'armed' reveals our ancestral relationship with tools - 'arms' originally meant any equipment or gear, which is why we still say 'coat of arms' for family symbols. Even octopi are described as having 'arms', showing how we project human tool-use onto other creatures.
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