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.
(..) Who did this to you? (CHOKING) Was it the sons of Ragnar Lothbrok? Their army. How big is their army? How many warriors? How many blades of grass are there in a field? What does that mean? Hundreds? Thousands? - Tell me, come on. - (SHUDDERS) (..)2017 TvShow: Vikings Title: On the Eve Season: 4 Episode 19