noun
armed merchant ship
Military term for a merchant vessel equipped with weapons, typically for self-defense or wartime use.
第二次世界大戦中、多くの武装商船が輸送船団を護衛した。
During World War II, many armed merchant ships escorted convoys.
Compound of 武装 (ぶそう, 'armament') and 商船 (しょうせん, 'merchant ship').