back yard

noun

1. the portion of a lot or building site behind a house, structure, or the like, sometimes fenced, walled, etc.
2. a familiar or nearby area; neighborhood.

noun

1. a yard at the back of a house, etc
2. in one’s own back yard
   1. close at hand
   2. involving or implicating oneSee NIMBY

n.

also back-yard, 1650s (perhaps early 15c.), from back (adj.) + yard (n.1).