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Related to eight ball: behind the eight ball
1. A black pool ball that bears the number eight.
2. A game in billiards played with a cue ball and 15 object balls in which the winner must pocket the eight ball after pocketing the seven balls numbered either higher than or lower than the eight ball, with the requirement that the cue ball must first strike one of the seven balls allotted to a player for a shot to be legitimate. A player who pockets the eight ball before the other seven automatically loses.
behind the eight ball Slang
In an unfavorable or uncomfortable position.
1. (Billiards & Snooker) (in pool) the black ball, marked with the number eight
2. behind the eight ball in a difficult situation; snookered