ĭn-aestŭo, āre, v. n.,
to boil or rage in any thing (rare): bilis, Hor. Epod. 11, 15: succensi stomacho fellis inaestuans (impietas), Prud. adv. Symm. 1, praef. 58.
in-aestuō —, —, āre, to boil in, rage within: inaestuat praecordiis bilis, H. ...
An Elementary Latin Dictionary