Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dē-grĕdĭor, gressus, 3, v. dep. [gradior], to go down, march down, descend (never, to go away, depart, like digredior— freq. only after the Aug. period, esp. in Liv. and Tac.): de via in semitam, Plaut. Cas. 3, 5, 40 (dub.): degressus ex arce, Liv. 5, 52: templo, id. 8, 35: monte, Sall. J. 49, 4: colle, id. ib. 50, 1: jugis, Tac. H. 1, 61: Alpibus, id. ib. 2, 66 fin.: palatio, id. ib. 3, 67 al.
Absol.: degrediente eo magnā prosequentium multitudine, Tac. A. 13, 14; 13, 54; id. H. 2, 51; id. Agr. 37; Plin. 8, 16, 21, § 58: in campum, Liv. 7, 24; 44, 5 fin.: in specum, Tac. A. 2, 54 fin.: in aequum, id. Agr. 18: ad pedes, to alight, dismount, Liv. 3, 62 fin.; 29, 2. (In Cic. de Or. 2, 19, 80, the true reading is digredi.)