noun
- Pool.
- a black ball bearing the number eight.
- a game in which one player or side must pocket all of either the solid-color balls or the striped ones before being permitted to attempt the pocketing of the eightball, which wins.
- Slang. an inept person.
- behind the eightball, Informal. in a difficult, disadvantageous, or uncomfortable situation: He hasn’t studied all term, and now he’s behind the eightball.
noun US and Canadian
- (in pool) the black ball, marked with the number eight
- behind the eight ball in a difficult situation; snookered