Backgammon

Etymology
Probably from back: +, gamen:

Noun

 * 1) A board game for two players in which each has 15 stones which move between 24 triangular points according to the roll of a pair of dice; the object is to move all of one's pieces around, and bear them off the board.
 * 2) A victory in the game when the loser has not borne off a stone, and still has one or more stones in the winner's inner home row or on the bar.

Related terms

 * gammon

Verb

 * 1) To win at a backgammon game with the opponent having one or more pieces in the winner’s inner home row or on the bar.