poke your nose into

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

To involve or insert oneself in an intrusive or nosy manner into something that is not one's business or responsibility. I wish our 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
Farlex Dictionary of Idioms.

poke your nose into

take an intrusive interest in; pry into. informal
See also: nose, poke
Farlex Partner Idioms Dictionary

poke/stick your nose in/into something

(informal) interfere in the affairs or business of other people: She’s always sticking her nose into other people’s affairs. It’s really annoying. What happens in this department does not concern him. Why does he have to poke his nose into everything all the time?
See also: nose, poke, something, stick
Farlex Partner Idioms Dictionary
See also:
  • poke (one's) nose in(to) (something)
  • poke nose in
  • poke one's nose into
  • poke your nose into something
  • poke/stick your nose in/into something
  • thrust (one's) nose in(to) (something)
  • put (one's) nose (in) where it's not wanted
  • put nose in
  • put one’s nose in
  • put one’s nose in where it’s not wanted
References in classic literature
You are afraid to poke your nose into any room in the house now; so, after walking up and down the stairs for a while, you go and sit in your own bedroom.
Three Men In A Boat
If you really want to poke your nose into the country, take the Lakes, Mountains & Ming Townships tour, only possible because of a new airport, road and hotel in Jiuzhaigou.
TRAVEL: PEKING AT OLD CHINA
IT'S not always appropriate or polite to poke your nose into someone else's argument, but I have to comment on the row caused by Elaine C Smith's comments about Marvin Andrews, the Rangers player, and God's football allegiance.
TOMMY SHERIDAN: GOD MUST BE A FAN OF SAINTS