From Longman Dictionary of Contemporary Englishin somebody’s own backyardin somebody’s own backyardinformal very near where someone lives, works etc Americans would probably react differently to the war if it was in their own back yard. → backyard
Examples from the Corpus
in somebody’s own backyard• Of course, every fly-blown congressman is keen to install fresh weapons of death in his own backyard.• Make it in your own backyard.• Now those efforts can begin right in your own backyard, when the Gardens' devotees host their annual fall plant sale.• They have a big stockmarket in their own backyard.• It will be easier to find a soul mate elsewhere than in one's own backyard.• And as they were fretting about it being nicked, it turned up in their own backyard. 