The term 'DOUBLE' can refer to two different concepts. The first is a HIT in baseball, which is when a batter strikes the ball and reaches a base safely. A DOUBLE is when the batter hits the ball and reaches second base. The second concept is a BID in bridge, which is an offer made by one of the players to win a certain number of tricks. A DOUBLE is when one player offers to win more than the number of tricks that were originally BID.