1. a person noted for speed and skill in handling and shooting a gun especially in the American West.
2. gun fighter.
3. a person who acts in an aggressive and decisive manner, especially in business or politics, as an investor who takes large risks in seeking large, quick gains.
Etymology: gun (from Middle English gunne, gonne, apparently short for Anglo-Latin Gunilda, gonnyld, name for engine of war; compare Old Norse Gunna, short for Gunnhildr,woman’s name) + sling (from Middle English slyngen < Old Norse slyngva, “to sling, fling”, cognate with Old English slingan, “to wind, twist”) + -er (a suffix used in forming nouns designating persons from the object of their occupation or labour, or from their place of origin or abode).
While on my summer vacation, I headed up to Bliss, Michigan to photograph a couple of polo games that were going on that afternoon. I was amazed by all that goes in to running the tournament— so many horses and so few people!