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]
(..) -Driven one ot.... -Yeah. No. Mac. Well. it's a lot ot tun. Come on over here. Put your hands on the wheel. -Put your hands on. -l've never done this. Put your hands on the wheel so you don't tall down. All right. Just hold it steady right there. like that. (..)1975 One Flew Over the Cuckoo's Nest