Source : Webster's Revised Unabridged Dictionary (1913)

Obrogate \Ob"ro*gate\, v. t. [L. obrogatus, p. p. of obrogare to
   obrogate.]
   To annul indirectly by enacting a new and contrary law,
   instead of by expressly abrogating or repealing the old one.
   [Obs.] --Bailey.