IPA: /ˈspɪəɡʌn/
KK: /ˈspɪrˌɡʌn/
A device that shoots a spear, typically used for fishing underwater.
He used a speargun to catch fish while diving.
Speargun → It is formed from "spear" (from Old English *spear*, meaning a long, pointed weapon) and "gun" (from Old French *gunne*, meaning a device for shooting). The word "speargun" refers to a device that shoots a spear, typically used for fishing or hunting.
Think of a long, pointed weapon ('spear') being shot from a device ('gun') — that's how a speargun works.