With today's announcement, she has 'set the wheels in motion' for a run for the presidency. [=she has begun to run for president]
You could almost see the 'wheels' turning in his head. [=you could almost see him thinking about how to do something]
They hoped that the tax cuts would 'grease the wheels' of the economy. [=would help the economy work better]
(..) You okay? Oh, shit. Come on, girl, you all right? Come on, let me look at you. Come on. We got to go. Let's go. Vince! Take the wheel. - What do you mean? - Put your foot on the gas! I'm gonna get him. Put your foot on the gas! Okay! (..)2001 The Fast and the Furious