Lewis & Short

in-frĕmo, ŭi, 3, v. n., to make or utter a noise (poet.).

  1. I. Lit., to growl, bellow: infremuitque ferox, of the wild boar, Verg. A. 10, 711.
  2. II. Transf., of things, to roar, rage: bellum infremuit, Sil. 3, 230.