on the bubble

Etymology
US, late 20th century, from Indiana motor racing.

Prepositional phrase

 * 1)  Holding the last qualifying position with qualification still in progress, and thus liable to lose that position.
 * Smith was on the bubble but lost out when Jones was faster by a tenth of a second.
 * 1)  Having qualification for an event depend on the upcoming performances of other competitors; hence, at risk of being eliminated, and reversely, being close to qualification; on the verge.
 * The Knights had been on the bubble for the tournament, but played their way in by winning their last five games.
 * 1)  Uncertain of success.
 * The new bond issue now appears to be on the bubble, with support eroding.
 * 1)  Uncertain of success.
 * The new bond issue now appears to be on the bubble, with support eroding.