err Look up err at Dictionary.com
c.1300, from O.Fr. errer, from L. errare "wander, go astray, be in error" (a general Gmc. borrowing, cf. O.H.G. arunti "message," O.N. erendi, Goth. airziža "error, deception"), from PIE base *ers- "wander around" (cf. Skt. arsati "flows," O.E. ierre "angry, straying").