definition of
bubble

[1] #1 bubble n. a hollow globule of gas (e.g., air or carbon dioxide). wn

[2] #2 bubble v. form, produce, or emit bubbles; "The soup was bubbling". wn

[3] #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] #4 bubble v. [ripple, babble, guggle, burble, gurgle] flow in an irregular current with a bubbling noise; "babbling brooks". wn

[5] #5 bubble n. an impracticable and illusory idea; "he didn't want to burst the newcomer's bubble". wn