1pas·ture 
/ˈpæstʃɚ, Brit ˈpɑ:stʃə/ noun
plural pas·tures /ˈpæstʃɚ, Brit ˈpɑ:stʃə/ noun : a large area of land where animals feed on the grass [count] ▪ The horses were grazing in the pasture. [noncount] ▪ Most of their land is pasture. ▪ She put/sent/turned the sheep out to pasture. [=she brought the sheep to a pasture to eat the grass]
greener pastures or Brit pastures new
: a new and better place or situation
▪ He left for greener pastures after working here for 10 years. ▪ She is looking for pastures new.
▪ He left for greener pastures after working here for 10 years. ▪ She is looking for pastures new.
put (someone) out to pasture
: to force (someone) to leave a job because of old age
▪ I'm not ready to be put out to pasture yet. — sometimes used of things ▪ I put my old computer out to pasture. [=got rid of my old computer]
▪ I'm not ready to be put out to pasture yet. — sometimes used of things ▪ I put my old computer out to pasture. [=got rid of my old computer]
