IPA: /ˈmɛd.lər/
KK: /ˈmɛd.lɚ/
A person who gets involved in things that do not concern them, often causing trouble or annoyance.
She is known as a meddler because she always tries to interfere in other people's business.
Meddler → The word originates from the Middle English 'meddlen', which comes from the Old English 'meddian', meaning to mix or interfere. A meddler is someone who interferes or mixes in the affairs of others.
Think of someone who 'mixes' into other people's business — that's why a meddler is someone who interferes.