Intumesce

v. i.

1.

To enlarge or expand with heat; to swell; specifically, to swell up or bubble up under the action of heat, as before the blowpipe. [imp. & p. p. Intumesced ; p. pr. & vb. n. Intumescing .] In a higher heat, it intumesces, and melts into a yellowish black mass. - Kirwan.

Verb	1.	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" Synonyms: bubble up
	2.	intumesce - expand abnormally; "The bellies of the starving children are swelling" Synonyms: swell up, tumesce, tumefy, swell

bubble up, come up, rise, rise up, surface