Lewis & Short

dē-fervĕo, ēre,

  1. I. v. n., to boil thoroughly; of wine, to ferment completely, Plin. 14, 9, 11, § 85; of lime and water, to effervesce, Vitr. 7, 2, 1.
  2. II. Trop., to subside: indignatio, Vulg. Esth. 2, 1.