Obs. [a. F. calomnier (16th c. in Littré), ad. late L. calumniāre for classical calumpniārī to CALUMNIATE. Cf. calumnier, etc.] To calumniate. Hence Calumnying vbl. sb.

1

1563.  Foxe, in Latimer’s Serm. & Rem. (1845), Introd. 10. Changing his old manner of calumnying into a diligent kind of conferring [etc.].

2