bubble in WordNet English dictionary

1. flow in an irregular current with a bubbling noise
   "babbling brooks"
   ripple  babble  guggle  burble  bubble  gurgle 
   
2. expel gas from the stomach
   "In China it is polite to burp at the table"
   burp  bubble  belch  eruct 
   
3. form, produce, or emit bubbles
   "The soup was bubbling"
   bubble 
   
4. cause to form bubbles
   "bubble gas through a liquid"
   bubble 
   
5. rise in bubbles or as if in bubbles
   "bubble to the surface"
   bubble 
   

1. a dome-shaped covering made of transparent glass or plastic
   bubble 
   
2. an impracticable and illusory idea
   "he didn't want to burst the newcomer's bubble"
   bubble 
   
3. 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"
   house of cards  bubble 
   
4. a hollow globule of gas (e.g., air or carbon dioxide)
   bubble