The idiom "stick your nose into something" means to interfere in someone else's business or to get involved in a situation that does not concern you. It is often used to describe someone who is being nosy or meddling in other people's affairs.
For example, if you see your neighbor arguing with their spouse and you walk over to listen in and offer your opinion, your neighbor might say, "Why are you sticking your nose into our business?"
Another example is if you are at work and a colleague is having a private conversation with their boss, and you try to eavesdrop or ask them about it later, they might say, "Don't stick your nose into my meeting."
In general, it is considered impolite to stick your nose into someone else's business unless you are asked for help or advice. It is important to respect people's privacy and boundaries.
• I'm always afraid to stick my nose into political conversations, as they can quickly become heated and contentious.
• The journalist was warned not to stick their nose into the ongoing investigation until it was complete.
• I don't like it when my little sister sticks her nose into my room without asking.
• I wish you wouldn't stick your nose into my personal affairs; it's none of your concern.
• I felt uncomfortable when my neighbor stuck his nose into my business without any invitation.
• The boss always sticks his nose into our work, even when he isn't needed.