1. (

• bubble_up ,
• intumesce

) move upwards in bubbles, as from the effect of heating; also used metaphorically; "Gases bubbled up from the earth"; "Marx's ideas have bubbled up in many places in Latin America" ;

2. (

• swell ,
• swell_up ,
• intumesce ,
• tumefy ,
• tumesce

) expand abnormally; "The bellies of the starving children are swelling" ;