If someone is put out to grass, they are made to retire from their job, or they are moved to a less important job, because people think that they are too old to be useful. As for the presenters of the show, they should have been put out to grass long ago. The Prime Minister refused to be put out to grass. Asked if he would quit, he replied `The answer is no.' Compare with put someone out to pasture. Note: When horses have reached the end of their working lives, they are sometimes released into fields to graze.