back ‧ yard BrE AmE , ˌback ˈyard /ˌbækˈjɑːd◂ $ -ˈjɑːrd◂/ noun [countable]
1 . British English a small area behind a house, covered with a hard surface
2 . American English an area of land behind a house, often covered with grass:
The old man grew vegetables in his backyard.
3 . in sb’s own backyard informal very near where someone lives, works etc:
Americans would probably react differently to the war if it was in their own back yard.
4 . not in my backyard used to say that you do not want something to happen near where you live
—backyard adjective [only before noun] :
a backyard pool