intumesce

verbs

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"
bubble up, intumesce
expand abnormally
"The bellies of the starving children are swelling"
intumesce, swell, swell up, tumefy, tumesce
is derived from
intumescency
is derived from
intumescence