Lewis & Short

rĕ-grădo, āvi, ātum, 1, v. a. [re-gradus].

  1. I. To degrade in rank, set back, lower (late Lat.), Hier. adv. Johan. Hieros. 19; Novel. Theod. 2, 21, 1: usque ad decimum locum regradari, Cod. Just. 12, 17, 3: sacerdotes qui peccaverant regradantur in aedituos, Hier. in Jovin. 2, 28.
  2. II. To bring back into the former order, to rearrange as before (by intercalation), Sol. 1, 45.