The Collaborative International Dictionary of English v.0.48:

Fustigate \Fus"ti*gate\, v. t. [L. fustigare, fr. fustis stick.
   See 1st Fust.]
   To cudgel. [R.] --Bailey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fustigate
    v 1: strike with a cudgel [syn: cudgel, fustigate]