IPA: /ˈɡʌnˌrʌn.ər/
KK: /ˈɡʌnˌrʌn.ər/
A person who illegally transports or sells guns and ammunition.
The authorities arrested a gunrunner who was trying to smuggle weapons across the border.
Gunrunner → It is formed from "gun" (originating from Middle English *gunne*, meaning a type of firearm) and "runner" (from Old English *rinnan*, meaning to run). The term "gunrunner" refers to someone who runs or transports firearms, typically illegally.
Think of someone who 'runs' ('rinnan') to transport 'guns' — that's why a gunrunner is someone who moves firearms.