soup up

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soup up ‎(third-person singular simple present soups up, present participle souping up, simple past and past participle souped up)

  1. To modify the engine of a motor vehicle to give a higher performance than the specifications.
    2009 October 19, Paul Rees, “Flying backs become walking wounded as blitz defence has its impact”, in The Guardian:
    Imagine souping up a Mini with a Cosworth engine: the car would fly.