Lewis & Short

dĕ-ĕo, īre, for abeo, very doubtful; defended by Gronov. ad Stat. Th. 2, 551; cf.: ullis ad signa deeuntibus, Sall. Fragm. in Mai. Auct. Class. 1, p. 418 (dub.: ex redeuntibus corruptum, Dietsch, Sall. Hist. 3, 67, 2).