[spook] n [D; akin to MLG spok ghost] (1801) 1: ghost, specter
2: an undercover agent: spy -- spook.ish adj
[2]spook vt (1883) 1: haunt 3
2: to make frightened or frantic: scare; esp: to startle into violent activity (as stampeding) ~ vi: to become spooked "cattle ~ing at shadows"