He has never been one to 'let the grass grow under his feet'. [=he has never been slow about doing things; he gets things done quickly]
The young candidate hoped to gather votes at the 'grassroots' level in his own neighborhood.
I'm not ready to be 'put out to grass' [='put out to pasture'] just yet.
(..) Maybe we could clear out of this town. Get to feel like people. - Live like we just got out of a tunnel. - A tunnel? You've never seen prairie grass with the wind leaning on it, have you? Does the wind get tired out there? Or angry little mountain streams, or the sun moving against the cattle. (..)1939 Mr. Smith Goes to Washington