Bubble or On the Bubble

Definition: In a poker tournament, the "bubble" is the point in the tournament at which the next player out will not win any money, but the rest of the players will win money or cash. In other words, if the tournament pays out the top 27 players, when there are 28 people left, they are on the bubble. That unfortunate player knocked out in 28th is said to be knocked out "on the bubble."