A person who operates or fires a gun, especially in a military or combat context.
From 'gun' (originally from Old Norse 'gunnr' meaning war) plus the agent suffix '-ar', creating a term for someone who uses guns professionally.
Gunnar became especially famous as a military term during WWII, and the Norse root 'gunnr' shows how warfare vocabulary traveled from Scandinavian languages into English through centuries of Viking contact.
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