武装
ぶそう · busou · JLPT N1 · noun
weaponry
🛡️⚔️ 武 (martial, war) + 装 (equip, dress): to equip oneself for battle
Breaks down as 武 'martial/warlike' plus 装 'outfit/equip'. Think of gear for war: weapons and armour together, which is why it means arms, armament, or armed.
装 — clothes 衣 + strong 壮 (phonetic)
装 is a semantic-phonetic compound. The bottom 衣 ('clothes') gives the meaning, since the original sense was packing or dressing—putting clothes or goods into a bundle. The top 壮 supplies the sound. Meanings extended from 'to dress/attire' to 'to load, install, pretend'.