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.
(..) Both sets of bones were porous. As if the virus were decomposing it. - And you've never seen that virus before? - No. Look at that. - That look like new grass to you? - Pretty green for this climate. Ground's dry about an inch down. This was laid recently. The equipment's brand-new, too. (..)1998 The X Files