Lewis & Short

ex-aestŭo, āvi, ātum, 1, v. n. and a., to boil up, foam up, ferment (not freq. till after the Aug. period; in Cic. and Caes. not at all).

  1. I. Neut.
    1. A. Lit.
      1. 1. In gen.: exaestuat mare, Liv. 26, 42 fin.; Curt. 6, 4: fretum, id. 4, 2: unda ima verticibus, Verg. G. 3, 240: Aetna fundo imo, id. A. 3, 577: bitumen e terra, Just. 1, 2, 7: Nilus in fossas, Suet. Aug, 18.
      2. 2. In partic., to effervesce, to glow with heat: Aegyptus torrenti calore solis exaestuat, Just. 2, 1, 16.
        Absol.: ut exaestuarat, had overheated himself, Suet. Tib. 72 med.
    2. B. Trop.: mens exaestuat irā, Verg. A. 9, 798; so, irā, Ov. M. 6, 623; 13, 559; Stat. Th. 11, 297: dolor exaestuat intus, Ov. Tr. 5, 1, 63; cf. ignis (amoris), id. M. 13, 867; poet.: vates magno igni, Luc. 5, 173.
  2. II. Act., to boil up with, to give forth, exhale (very rarely): hos igitur tellus omnes exaestuat aestus, Lucr. 6, 816; so, aestus, id. 2, 1137.