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bang out

Produce something loudly or hastily by striking, either a musical instrument or a typing keyboard. For example, The accompanist banged out the melody on the piano, or John planned to bang out his presentation in a couple of hours. [Late 1800s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.