poke nose in

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. 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 one's nose in (to something)

 and stick one's nose in (to something)
Fig. to interfere with something; to be nosy about something. I wish you'd stop poking your nose into my business. She was too upset for me to stick my nose in and ask what was wrong.
See also: nose, poke