poke your nose into something

poke (one's) nose in(to) (something)

To involve oneself in an intrusive or nosy manner into something that is not one's business or responsibility. Primarily heard in UK. I wish my neighbors would quit poking their noses in and just leave us alone! Don't poke your nose into your brother's affairs—he can manage well enough on his own.
See also: nose, poke

poke your nose into something

or

stick your nose into something

INFORMAL
COMMON If someone pokes their nose into something or sticks their nose into it, they interfere in something that does not concern them. He has no right to go poking his nose into my affairs. I felt that they were sticking their noses into what was only my business. Compare with keep your nose out of something.
See also: nose, poke, something