n.
  - a thin sphere of liquid enclosing air or another gas. ▸an air- or gas-filled spherical cavity in a liquid or a solidified liquid such as glass. 
- a transparent domed cover or enclosure.
v.
   - (of a liquid) be agitated by rising bubbles of air or gas.
- 
(bubble with)
 be filled with (an irrepressible positive feeling).
- 
(bubble up)
 (of a feeling) intensify to the point of being expressed.
Etymology
  ME: partly imitative, partly an alt. of burble.