Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sub-vŏlo, āre, v. n., to fly up or upwards (rare but class.): hae (partes corporum) sursum in caelestem locum subvo lent, Cic. Tusc. 1, 17, 40: avis, Ov. M. 11, 790: ex agmine, id. ib. 14, 507: praepes, id. ib. 14, 577: ad capita, Aug. Civ. Dei, 18, 16 fin.: alte, Aur. Vict. Vir. Ill. 6, 3.