BUBBLE

Definition

1. noun a hollow globule of gas (e.g., air or carbon dioxide).
2. noun a speculative scheme that depends on unstable factors that the planner cannot control. — synonyms: house_of_cards
3. noun an impracticable and illusory idea.
4. noun a dome-shaped covering made of transparent glass or plastic.
5. verb form, produce, or emit bubbles.
6. verb flow in an irregular current with a bubbling noise. — synonyms: ripple, babble, guggle, burble, gurgle
7. verb rise in bubbles or as if in bubbles.
8. verb cause to form bubbles.
9. verb expel gas from the stomach. — synonyms: burp, belch, eruct