In terrorem

In terrorem, Latin for "in [order to] frighten," is a legal term used to describe a warning, usually one given in hope of compelling someone to act without resorting to a lawsuit or criminal prosecution. For example, many intellectual property attorneys send in terrorem letters, which threaten litigation absent compliance with the written request, to persons that are violating their clients' trademark rights before resorting to court proceedings.
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As a warning; in order to terrify others

pod groźbą

As a warning or deterrent