(as) black as thunder
Full of rage or hostility, likened to the black clouds that accompany thunderstorms. When I looked up, his face was as black as thunder, and I knew that I was in trouble. Uh, the boss is giving us a scowl that's as black as thunder. Did you accidentally disconnect that call you were supposed to transfer? I knew we were headed for a full-on tantrum when the look on Rosie's face turned black as thunder.
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