bubble

a hollow globule of gas (e.g., air or carbon dioxide)

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"

an impracticable and illusory idea; "he didn't want to burst the newcomer's bubble"

a dome-shaped covering made of transparent glass or plastic

form, produce, or emit bubbles; "The soup was bubbling"

flow in an irregular current with a bubbling noise; "babbling brooks"

rise in bubbles or as if in bubbles; "bubble to the surface"

cause to form bubbles; "bubble gas through a liquid"

expel gas from the stomach; "In China it is polite to burp at the table"