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[for a loud sound] to sound out like thunder. His voice boomed out such that everyone could hear. An explosion boomed out and frightened us all.
boom something out
[for someone] to say something very loud; to shout. Will someone with a loud voice boom the names out? The announcer boomed out the names of the players.
1. To make a loud, deep sound: Rock music suddenly boomed out from the speakers.
2. To say something very loudly: She boomed her speech out to the entire building over the public address system. He boomed out the sermon in his thunderous voice.