From eu and a derivative of a presumed compound of peri and histemi; well standing around, i.e. (a competitor) thwarting (a racer) in every direction (figuratively, of sin in genitive case) -- which doth so easily beset.

see GREEK eu

see GREEK peri

see GREEK histemi

εὐπερίστατον (euperistaton) − 1 Occurrence