To behave in a way that is likely to cause problems.
To harass, pester or annoy someone persistently or incessantly.
To afflict with a disease or other calamity.
A group of common grackles.
A widespread affliction, calamity or destructive influx, especially when seen as divine retribution.
The bubonic plague, the pestilent disease caused by the virulent bacterium Yersinia pestis.
An epidemic or pandemic caused by any pestilence, but specifically by the above disease.
A grave nuisance, whatever greatly irritates.