Lewis & Short

păvesco, ĕre, v. inch. n. and a. [paveo] (mostly post-Aug.).

        1. (α) Neutr., to begin to be afraid, to become alarmed: omni strepitu pavescere, Sall. J. 72, 2: ad ejusmodi tactum, Col. 6, 2: ad nocturnas imagines, Plin. 29, 4, 20, § 67 (al. expavescere): pavescere sensim et quasi albescere, Gell. 19, 1, 21.
        2. (β) Act., to begin to fear or dread, to begin to be alarmed at: bellum, Tac. A. 1, 4: prodigia deūm, Sil. 16, 127.