boxcars
noun
1
in horse racing, high odds. From the high numbers used to identify railway carriages US, 1934.
2
in a game of dice, a roll of two sixes US, 1949.
3
in poker, a pair of sixes or three sixes. A borrowing from the game of craps US, 1988.
4
any large number; a long prison sentence US, 1950