horrēscō horruī, -, ere, inch. horreo, to rise on end, stand erect, bristle up, grow rough: horruerunt comae, O.: segetes horrescunt flabris, V.: saetis, O.

—To begin to shake, shudder, tremble, be terrified, fear, dread: horresco semper, ubi, etc., T.: ferae horrescunt: visu subito, V.: procellas, H.: morsūs futuros, V.