1. Chess.the advance of a pawn, in its original move only, from its initial position on the second rank to the fourth without stopping at the intervening square.
2. Checkers.the capturing of two of the opponent's checkers in two uninterrupted jumps, constituting a single move by one piece.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.