back forty
or back 40
noun
remote, usually uncultivated acreage on a large piece of land, as on a farm or ranch.
Origin of back forty
apparently because forty acres was a typical size for such a piece of land
Words nearby back forty
back end,
back float,
back focus,
back foot,
back formation,
back forty,
back four,
back gear,
back green,
back hack,
back in circulation