Back Game/Holding Game
Bear In/Bear Off/Bearoff
Losing a blot is especially frustrating if it is closed out or shutout, which occurs when a checker on the bar can't re-enter play because all points on your outer board are occupied by two or more of your opponent's checkers.
No, this doesn't mean your Internet connection status when playing backgammon online. Connectivity means positioning checkers so that they're within six points or less of your other checkers, enabling you to form points and avoid blots.
Gammon is the backgammon term for bearing off all of your checkers before your opponent has peeled any (or vice versa). If you're playing with a cube, a gammon is worth twice the points.
Inner Board/hHome Board/Outer Board
Your inner board or home board is the quadrant with the six points your checkers must occupy before bearoff. Your opponent's inner board is your outer board.
Stacking refers to the backgammon style often used by timid or defensive players. Checkers are used to establish points and avoid exposing blots, leading to checker formations that resemble candlesticks.