to modify (a vehicle or vehicle engine) in order to increase its power
Also: hot up, (esp US and Canadian) hop up to make (something) more exciting or interesting
(of a vehicle or vehicle engine) modified so as to be more powerful: a souped-up scooter
more exciting or interesting: a souped-up version of their last single
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use soup up in a sentence
Last night a lady had her soup up-stairs, her chicken in the office, and her coffee in the cellar.A Traveller in War-Time | Winston Churchill
Just before you take the soup up, put in a couple of slices of toast, cut into small pieces.
Return the liquid to the saucepan, add the milk, and boil the soup up again.
When the barley is quite soft, add the milk and parsley, boil the soup up, and serve.
When the vegetables are tender drain the liquid; return it to the saucepan, and boil the soup up.
Other Idioms and Phrases with soup up
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® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.