a law unto themselves Meaning If somebody is a law unto them | English Language

a law unto themselves

Meaning
If somebody is a law unto themselves, they do things their own way and follow their own ideas about how to live instead of following what others do.

For example

Our boy Billy is a law unto himself. Of course he sometimes makes mistakes and gets into trouble, but we're proud of him because he doesn't just follow the herd.

Our boss does things a bit differently to most other managers, so it's no surprise that some people say he's a law unto himself.
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