[n] a dome-shaped covering made of transparent glass or plastic
[n] an impracticable and illusory idea; "he didn't want to burst the newcomer's bubble"
[n] 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"
[n] a hollow globule of gas (e.g., air or carbon dioxide)
[v] expel gas from the stomach; "In China it is polite to burp at the table"
[v] form produce, or emit bubbles, as of liquids or gases; "The soup was bubbling"
[v] flow in an irregular current with a bubbling noise, as of water; "babbling brooks"