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]
(..) - Uh, yeah, she knows her way around. - Thanks. Tell her to prep everything, Barton's gonna need the full treatment. - Very good sir. - Jarvis, take the wheel. - Yes, sir. Approach vector is locked. It feels good, yeah? I mean, you've been after this thing ever since SHIELD collapsed. (..)2015 Avengers: Age of Ultron