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Definition of On the bubble
1. Adjective. (context: motor racing) Holding the last qualifying position with qualification still in progress, and thus liable to lose that position. ¹
2. Adjective. (sports) Having qualification for an event depend on the upcoming performances of other competitors. ¹
3. Adjective. (idiomatic) Uncertain of success. ¹
¹ Source: wiktionary.com