1. Gun. The difference between the diameter of the bore of a gun and that of the shot fired from it.
2. The sudden compression of the air caused by a projectile in passing close to another body.
n 1: the retarding force of air friction on a moving object
2: bore-to-projectile difference in diameter
3: exposure to the wind (as the exposed part of a vessel's hull
which is responsible for wind resistance) [syn: wind
4: the deflection of a projectile resulting from the effects of
wind [syn: wind deflection]