She put/sent/turned the sheep 'out to pasture'. [=she brought the sheep to a pasture to eat the grass]
I 'put' my old computer 'out to pasture'. [=got rid of my old computer]
He left for 'greener pastures' after working here for 10 years.
(..) migrate across the Arctic tundra. The immensity of the herd can only be properly appreciated from the air. Some herds travel over miles a year in search of fresh pastures. This is the longest overland migration made by any animal. They're constantly on the move. Newborn calves have to be (..)2006 TvShow: Planet Earth Title: From Pole to Pole Season: 1 Episode 1