Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
offringo (obfr-), ēgi, actum, 3, v. a. [ob-frango], t. t. of agriculture, i. q. iterare, to plough a second time; to cross-plough: terram cum primum arant, proscindere appellant; cum iterum, offringere dicunt, to cross-plough, Varr. R. R. 1, 29; id. ib. 32: glaebas, Col. 2, 11, 3; cf.: offringi terra dicitur, cum iterum transverso sulco aratur, Paul. ex Fest. p. 199 Müll.