Lewis & Short

1. casso, āvi, ātum, 1, v. a. [cassus] (late Lat.).

  1. I. In gen., to bring to naught, destroy, trop., Sid. Ep. 1 fin.
  2. II. In the Lat. of the jurists, to annul, make null or void, = abrogo, Cod. Th. 11, 1, 3 al.