What does "leave to one's own devices" mean? Is it an idiom? If so, could you give me some examples?

Native speaker’s answer
Rebecca
To "be left to one's own devices" is an idiom! It means to do what one wants without being controlled or helped by someone else; to allow someone to make their own decisions. Here, she's saying that when she has to decide things on her own, it doesn't end up going well for her! Ex: Puppies shouldn't be left to their own devices. They can make such a mess. Ex: I'm good at being left to my own devices. I'm pretty independent and responsible. Ex: I'll leave you to your own devices. You can handle this project, John.