noun
Literal physical weapon: swords, guns, bombs, etc. Used in military, police, and everyday contexts.
警察は犯人の武器を押収した。
The police seized the suspect's weapon.
この国では武器の所持が厳しく規制されて
Possession of weapons is strictly regulated in this country.
noun
weapon (figurative); asset; advantage
Figurative use: something used to gain an advantage, such as a skill, knowledge, or personal trait. Often appears in phrases like 武器になる (to be an asset).
語学力は就職活動で大きな武器になる。
Language skills are a big asset in job hunting.
彼の冷静さが交渉の武器となった。
His calmness became a weapon in the negotiation.