Source : Webster's Revised Unabridged Dictionary (1913)

   {Snap back} (Football), the act of snapping back the ball.

   {Snap beetle}, or {Snap bug} (Zo["o]l.), any beetle of the
      family {Elaterid[ae]}, which, when laid on its back, is
      able to leap to a considerable height by means of a
      thoracic spring; -- called also {snapping beetle}.

   {Snap flask} (Molding), a flask for small work, having its
      sides separable and held together by latches, so that the
      flask may be removed from around the sand mold.

   {Snap judgment}, a judgment formed on the instant without
      deliberation.

   {Snap lock}, a lock shutting with a catch or snap.

   {Snap riveting}, riveting in which the rivets have snapheads
      formed by a die or swaging tool.

   {Snap shot}, a quick offhand shot, without deliberately
      taking aim.