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.
(..) Do you remember the taste of strawberries? No, Sam. I can't recall the taste of food... ...nor the sound of water... ...nor the touch of grass. I'm... ...naked in the dark. There's... There's nothing. No veil between me and the wheel of fire. (..)2003 The Lord of the Rings: The Return of the King