Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
occŭbo, āre, 1, v. n. [ob-cubo], to lie in a place; to rest, repose in the grave (poet.): ad tumulum, quo maximus occubat Hector, Verg. A. 5, 371: Paris urbe paternā occubat, id. ib. 10, 706: crudelibus occubat umbris, reposes with the dead, id. ib. 1, 547: flebili leto, Sen. Hippol. 997: consul pro vestrā victoriā morte occubans, Liv. 8, 10, 4.