in terrorem

From Latin in terrorem.

in terrorem (not comparable)

1. As a warning or deterrent; in order to terrify or deter others.
   • 1751, Tobias Smollett, The Adventures of Peregrine Pickle, I.20:

     [N]otwithstanding the intercession of his governor, who begged earnestly that his punishment might be mitigated, our unfortunate hero was publickly horsed, in terrorem of all whom it might concern.

   • 1971, Daily Telegraph, 1 July:

     This idea that the Treaty of Rome, like diamonds, is forever, is held in terrorem over people.

• terror