obrogate

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]