On-erian

According to the Old English Dictionary:

on-erian

to plough up:--Wé ma lufiaþ ðone æcer ðe ǽr wæs mid þornum áswógen and æfter ðæm ðe ða þornas beóþ áheáwene and se æker biþ onered bringþ gódne wæsðm plus terram diligimus, quae post spinas exarata fructus uberes producit, Past. 52, 9; Swt. 411, 18. on-erian