Make go "Vroom!"

REVUP

Think of what you do to an engine before a race to get it roaring at full power. The word starts with the sound of a spinning wheel backward.

"Make go 'Vroom!'" is a playful way to hint at revving an engine, which is what "REVUP" means—literally making a vehicle roar to life. The word "vroom" mimics the sound of an engine revving, so the clue ties the action (revving) to its onomatopoeic effect. It’s a straightforward definition with a fun, sound-based nudge toward the answer.