#1 bubble n. a hollow globule of gas (e.g., air or carbon dioxide). wn
#2 bubble v. form, produce, or emit bubbles; "The soup was bubbling". wn
#3 bubble n. [house of cards] 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". wn
#4 bubble v. [ripple, babble, guggle, burble, gurgle] flow in an irregular current with a bubbling noise; "babbling brooks". wn
#5 bubble n. an impracticable and illusory idea; "he didn't want to burst the newcomer's bubble". wn
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