PTTan 66.c:41[2]var. :ומדינתא אזלא בבאישות"בבישא‏ :
See the entire entry for bbyšh adv. antagonistically

PTTan 66.c:41[2] :מדינתא אזלא בבאישות‏ : while the city is disappearing in ruination (due to a plague)
See the entire entry for bīšūt, bīšūṯā n.f. evil