Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
(rĕ-sum = resideo, assumed as pres. for the var. l. l. resit, Cic. Scaur. 8, 14, where B. and K. read residet; and reesset, id. Verr. 2, 2, 58, § 143, B. and K. esset.)