Meddle (verb)

1. To interfere in the affairs of others, without being asked or welcome.
2. To take part or have a hand in something without being properly involved.

Origin:

From middle english medlen, from old english gemǣdlian ("to mix, mingle, associate with"), from gemǣdl ("companion, associate"), from gemǣdle ("companionship, association"), from gemǣd ("companion, associate") + -le.

Examples:

1. She told her sister not to meddle in her personal affairs.
2. He was always meddling in the affairs of the company.
3. She was accused of meddling in the election.
4. The politician was accused of meddling in the internal affairs of the country.
5. Don"t meddle in other people"s business.