A trigger is thus a troubling reminder of a traumatic event, although the trigger itself need not be frightening or traumatic.

The heftier paper is a troubling reminder to The Post's reporters that their good fortune has come at the expense of friends and former colleagues.

He rushed into a grocery store in Gravata, a well-to-do town nearby, in a troubling reminder of desperation in the backyard of affluence.

It was a troubling reminder that their lives might depend on someone with little experience on the job.

For some people, however, the fact that the weather remains as crystalline as it was on Sept. 11 is itself a troubling reminder of a day that will live in infamy.

The fires are being taken seriously by others as well, in no small part because they stand as troubling reminders of intolerance and intimidation that many thought was long gone.

These situations are a troubling reminder that intimacy can drive people apart as well as pull them together.

Drawing a deep breath, he tried to shrug off the troubling reminder of that tragic mission.

City officials said that the case was a troubling reminder that even when safeguards to protect children work efficiently, the city cannot save all children from domestic violence.

In a troubling reminder of technology's darker side, Virginia Tech, the state's largest university, has acknowledged that computer-aided cheating by students is growing rapidly.