intumesce

Verb
  1. Move upwards in bubbles, as from the effect of heating;
    Also used metaphorically (synset 201994960)
    "Gases bubbled up from the earth"; "Marx's ideas have bubbled up in many places in Latin America"
  2. Expand abnormally (synset 200257393)
    "The bellies of the starving children are swelling"

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