1.a hollow globule of gas (e.g., air or carbon dioxide)
2.a speculative scheme that depends on unstable factors that the planner cannot control;
his proposal was nothing but a house of cards
3.an impracticable and illusory idea;
he didn't want to burst the newcomer's bubble
4.a dome-shaped covering made of transparent glass or plastic
1.form, produce, or emit bubbles;
The soup was bubbling
2.flow in an irregular current with a bubbling noise;
babbling brooks
3.expel gas from the stomach;
In China it is polite to burp at the table