"intumesces" in the verb sense
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"
Source: WordNet® (An amazing lexical database of English)
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