in terrorem en · ADV
Etymology
From Latin in terrorem.
Meanings
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(not-comparable) As a warning or deterrent; in order to terrify or deter others.
[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.
1751, [Tobias] Smollett, The Adventures of Peregrine Pickle […], volume (please specify |volume=I to IV), London: Harrison and Co., […], →OCLC:This idea that the Treaty of Rome, like diamonds, is forever, is held in terrorem over people.
1971 July 1, Daily Telegraph: