Mind (one's) own business spoken language verb phrase
To take care of their affairs and not interfere in others'.
Can you just mind your own business? I can take care of my things.
Stop bothering me, mind your own business.
Don't ask me about the things between Jane and me anymore. Mind your own business.
Jane! I would appreciate that you leave me alone and mind your own business.
It is mostly used in the present tense.
A group of bad or sinful people
You'd better stay away from them. They are a nest of vipers.