storm cloud
noun uk/ˈstɔːm ˌklaʊd/ us/ˈstɔːrm ˌklaʊd/
[ C usually singular ]暴风云，暴雨云
a large, dark cloud that brings rain or comes before a storm
storm clouds[ plural ] literary 阴云，麻烦；（尤指）动乱的预兆
trouble, especially trouble that is going to happen soon
Economic storm clouds are gathering over India. 经济动荡的阴云笼罩着印度。
The storm clouds of war seem to be looming over the east. 战争的阴云似乎在东部地区弥漫。