Lewis Short
dē-grassor, āri
* V. dep. n. and a. *
* Neutr., to rush down: deorsum degrassantur aquae,App. de Deo Socr. p. 94.
* Act., poet. transf., to attack fiercely, to revile: primos duces,Stat. Ach. 1, 406 (cf. grassor with the acc., id. Theb. 8, 5, 4).
Charlton T. Lewis, Charles Short, A Latin Dictionary