Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ăd-obrŭo, ĕre, 3, v. a., to cover up with earth, to bury: alte circumfodere et adobruere, Col. 4, 15, 3; so 2, 11, 12; 5, 5, 2; 11, 2, 54 al.