1. (noun) bubble
a hollow globule of gas (e.g., air or carbon dioxide)
2. (noun) house of cards, bubble
a speculative scheme that depends on unstable factors that the planner cannot control
"his proposal was nothing but a house of cards"; "a real estate bubble"
3. (noun) bubble
an impracticable and illusory idea
"he didn't want to burst the newcomer's bubble"
4. (verb) bubble
a dome-shaped covering made of transparent glass or plastic
5. (verb) bubble
form, produce, or emit bubbles
"The soup was bubbling"
6. (verb) ripple, babble, guggle, burble, bubble, gurgle
flow in an irregular current with a bubbling noise
"babbling brooks"
7. (verb) bubble
rise in bubbles or as if in bubbles
"bubble to the surface"
8. (verb) bubble
cause to form bubbles
"bubble gas through a liquid"
9. (verb) burp, bubble, belch, eruct
expel gas from the stomach
"In China it is polite to burp at the table"
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Definition of 'bubble' 
