soup up

soup up idiom
Make something more powerful; especially, add speed to an engine. For example, He was riding around in that car he'd souped up, or They had to soup up the sound system for the outdoor concert. [Slang; c. 1930]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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