A person who operates or fires a gun, especially in military contexts or on aircraft.
From 'gun' (a weapon, possibly from Latin 'gunne' or Scandinavian 'gunnr' meaning war) + '-er' (one who does).
The oldest gunners were medieval soldiers who operated cannons, and they had a special rank—'Master Gunner'—because their skill was rare and incredibly dangerous, as cannons exploded almost as often as they fired.
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