stick nose in

stick (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 sticking their noses in and just leave us alone! Liam, don't stick your nose into your brother's affairs—he can manage well enough on his own.
See also: nose, stick

stick one's nose in

(to something) Go to poke one's nose in(to something).
See also: nose, stick