1) Be a busybody 2) Interfere 3) Intermeddle 4) Interpose 5) Intervene 6) Step in 
• (v. i.) To run between parties and intercept without right the advantage that one should gain from the other; to traffic without a proper license; to intrude; to forestall others; to intermeddle.
In`ter·lope' intransitive verb [ imperfect & past participle Interloped ; present participle & verbal noun Interloping .] [ See Interloper .] To run between parties and intercept without right the advantage that one should gain fro...
[v] - encroach on the rights of others, as in trading without a proper license
verb encroach on the rights of others, as in trading without a proper license
to intrude into some region or field of trade without a proper license. · to thrust oneself into the affairs of others.