“Trigger” is a medical term for people who have a brain injury called PTSD or TBI.
H. Nemesis Nyx

Thank you for this. I recently had a big argument with two Bernie bros about exactly this. I explained that it was a psychological term. I explained that I have PTSD. No amount of talking helped.

They both breezily dismissed me. “Well, it doesn’t mean that any more.” Maddening.