What is "poacher turned gamekeeper"

Usage examples of "poacher turned gamekeeper".

Returning to possible uses of viruses for positive purposes, there are proposals to exploit the ``poacher turned gamekeeper'' principle, and ``set a thief to catch a thief.

So, for the long period before the poacher turned gamekeeper, Morgan used Shark Bay as his sallyport.

Now he was the poacher turned gamekeeper, nurturing his own pension and security in the way he had once nurtured his networks.