In a borderline or precarious position with respect to selection, qualification, inclusion, or approval; uncertain whether one will be chosen, accepted, or succeed.
2.
Internationalneutral
Literally located on or adjacent to a bubble or a panel/area labeled 'bubble'; used in technical or descriptive contexts.
3.
Internationalneutral
About to boil or begin to bubble; on the verge of producing visible bubbles (chiefly used in literal physical/cooking contexts).