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1. To exit (something or some place) very quickly while making extremely loud, reverberating sounds. They jumped into the firetruck and thundered out of the station. The silo doors opened and the rocket thundered out into the night sky.
2. To say or shout something in a very deep, booming voice. A noun or pronoun can be used between "thunder" and "out." The director thundered out her commands to the actors on the stage. I wish the boss wouldn't thunder his criticisms out like that—I'd prefer it if the entire office didn't hear about my latest shortcomings.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
thunder something out
Fig. to respond with words spoken in a voice like thunder. He thundered the words out so everyone could hear them. He thundered out the words.