Of hair, feathers, etc.: standing up, bristling.

Of hair: Standing on end. Obsolete.

Rising on end. Obsolete. rare.

(up-, prefix affix 3b. Cf. upstart, v.)

Of hair, etc.: That rises or stands stiffly on end.

Of hair, etc.: Bristling. Of ears: Pricked up.

That has broken loose or become displaced from its habitual or correct position; awry; sticking out. Of the hair: sticking up. Now rare.

Bristling; standing up as bristles; rough with bristling points or projections.

causing horripilation.

Chiefly participial. Of the hair, tail of animals, etc.: Set up, rigid, bristling.