bubble
 
bubble
 (bŭbʹəl) noun
1.
	A thin, usually spherical or hemispherical film of liquid filled with air or gas: a soap bubble. 
2.
	A globular body of air or gas formed within a liquid: air bubbles rising to the surface. 
3.
	A pocket formed in a solid by air or gas that is trapped, as during cooling or hardening. 
4.
	a. The act or process of forming bubbles. b. A sound made by or as if by the forming and bursting of bubbles.
5.	Something insubstantial, groundless, or ephemeral, especially: a. A fantastic or impracticable idea or belief; an illusion: didn't want to burst the new volunteers' bubble. b. A speculative scheme that comes to nothing: lost money in the real estate bubble.
6.	Something light or effervescent: "Maconthough terribly distressedhad to fight down a bubble of laughter" (Anne Tyler). 
7.	A usually transparent glass or plastic dome. 
8.	A protective, often isolating envelope or cover: "The Secret Service will talk of tightening protection, but no President wants to live in a bubble" (Anthony Lewis). 
verb
bubbled
, bubbling, bubbles
 
verb
, intransitive
1.
	To form or give off bubbles. 
2.
	To move or flow with a gurgling sound: a brook bubbling along its course. 
3.
	To rise to or as if to the surface; emerge: "Since then, the revolution has bubbled up again in many forms" (Jonathan Schell). 
4.
	To display irrepressible activity or emotion: bubbling over with excitement. 
verb
, transitive
To cause to form bubbles. 
[From Middle English bubelen, to bubble.]