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Verb: intumesce  ,in-too'mes or ,in-tyû'mes [N. Amer], ,in-tyû'mes [Brit]
  1. Move upwards in bubbles, as from the effect of heating; also used metaphorically
    "Gases intumesced from the earth";
    - bubble up
  2. Expand abnormally
    "The bellies of the starving children are intumescing";
    - swell, swell up, tumefy, tumesce, puff

Derived forms: intumesced, intumesces, intumescing

Type of: come up, expand, rise, rise up, surface