A pattern of smokestack plume dispersion in a statically stable atmosphere, in which the plume spreads out in the horizontal like an oriental fan and meanders about at a fixed height with little vertical spread. Compare looping, coning, fumigation
Fanning is the art of rapidly shooting a single action revolver by holding the trigger in the pulled position and slapping the hammer back with the bottom of the free hand. This is often seen in western movies and is very hard on the gun. It can be dangerous as the forces might push the cocked or partially cocked firearm out of the shooter's hand.