ὑποφρίσσω · hypophrissō — LSJ
to be rather bristly, γενειὰς ὑποφρίττουσα Philostr.Jun. Im. 8; shudder a little, Luc. Peregr. 39, JConf. 4, Pr.Im. 12, Aët. 12.68; of an artery, Archig. ap. Gal. 8.90.
c. acc., feel dread before or of, Euph. 78, Gal. UP 14.4.
bristle, πολιῇσιν ἐθείραις Nonn. D. 35.55.