Lewis & Short

ĭn-ardesco, arsi, 3, v. inch.n., to kindle, take fire, burn, glow (poet. and in post-Aug. prose).

  1. I. Lit.: nubes Solis inardescit radiis, Verg. A. 8, 623: arbusculae in igne ut ferrum inardescentes, Plin. 13, 25, 51, § 140: nec munus (i. e. vestis) umeris Herculis Inarsit aestuosius, Hor. Epod. 3, 18: inardescunt genae, Sen. Herc. Oet. 251.
  2. II. Trop.: affectus omnis languescat necesse est, nisi voce, vultu, totius prope habitu corporis inardescat, Quint. 11, 3, 2: cupidine vindictae inardescere, Tac. A. 6, 32: ut vidit juvenem, specie praesentis inarsit, Ov. M. 7, 83.