Word forms: storm clouds
1. countable noun [usu pl]
Storm clouds are the dark clouds which are seen before a storm.
2. countable noun [usu pl] You can use storm clouds to refer to a sign that something very unpleasant is going to happen. [formal] ⇒ Over the past three weeks, the storm clouds have gathered again over the government.
COBUILD Advanced English Dictionary. Copyright © Harper Collins Publishers