bubble -- (a hollow globule of gas (e.g., air or carbon dioxide))
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")
bubble -- (an impracticable and illusory idea; "he didn't want to burst the newcomer's bubble")
bubble -- (a dome-shaped covering made of transparent glass or plastic)
Overview of verb bubble
The verb bubble has 5 senses
bubble -- (form, produce, or emit bubbles; "The soup was bubbling")
ripple, babble, guggle, burble, bubble, gurgle -- (flow in an irregular current with a bubbling noise; "babbling brooks")
bubble -- (rise in bubbles or as if in bubbles; "bubble to the surface")
bubble -- (cause to form bubbles; "bubble gas through a liquid")
burp, bubble, belch, eruct -- (expel gas from the stomach; "In China it is polite to burp at the table")