in your backyard idiom informal
在自家后院;在自己的住所;在自己的兴趣（或活动、责任）范围内
in the area where you live, or in the area of interest or activity that you are involved in or responsible for
How would you feel about them building a nuclear power station in your backyard? 如果他们在你家后院建核电厂，你会有什么感觉？
We should take a look at what is happening in our own backyard before criticizing what is taking place in other countries. 在批评别国的事情之前，我们应该先看看自己国内发生的事情。