To poke one's nose into other people's business; to be too inquisitive about matters that do not concern one

to meddle in affairs that are none of one's business

To refrain from meddling or interfering in things that are none of one's concern; often used as an angry warning or a blunt piece of advice.

to poke one's nose into other people's business; to be meddlesome or officious

a dog catching mice is meddling in other people's affairs; to be meddlesome or interfere where one is not needed