0 a statement at the beginning of a piece of writing, before the start of a film, etc., warning people that they may find the content very upsetting, especially if they have experienced something similar:
Trigger warnings are supposed to protect people from post-traumatic flashbacks.
A trigger warning might have prevented -- or perhaps merely ensured -- these absences.
Would giving this "trigger warning" not be part of the professor's academic freedom?
And this is trigger warning.
The letter is, in effect, a trigger warning to incoming students preemptively warning them to expect a dearth of trigger warnings in their time on campus.
That sounds reasonable enough, but it's unlikely to get critics of campus identity politics to stop raving about trigger warnings.
The notion that trigger warnings violate "freedom of expression" has a similar smokescreen quality.
We mock professors for issuing "trigger warnings" in the classroom.
Considered in isolation, trigger warnings may seem straightforwardly good.