"....and nobody would ever, ever let him forget that it had been he who had captained Gryffindor to their first bottom-of-the-table defeat in two centuries."
-- Harry Potter's thoughts prior to the Gryffindor v Ravenclaw match (HBP24)
The position of last place in the standings, either at the end of a sports tournament/competition or at the end of the season in the league table.
When persuading him to do a last favour, Dumbledore says to Snape with certainty: "as surely as the Chudley Cannons will finish bottom of this year’s league" (DH33).
The term "bottom-of-the-league" can also be used to describe the team that is sitting in last place.