horrĭpĭlo, āre, v. n. [horreo-pilus],
to bristle with hairs , be shaggy (post-class.): aures immodicis horripilant auctibus, Ap. Met. 3, 24, 15: horripilo ὀρθοτριχάω, horripilatur ὀρθοτριχεῖ, Gloss. Philox.