水すい中ちゅう銃じゅう

noun

speargun; underwater gun

Refers to a device that shoots projectiles underwater, typically used in spearfishing or underwater combat.

• 彼かれは水すい中ちゅう銃じゅうで大おおきな魚さかなを捕つかまえた。

  He caught a big fish with a speargun.