interlope

To run between parties and intercept the advantage that one should gain from the other; traffic without a proper license; forestall.

To obtrude one’s self into a business in which one has no right.

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.

To intrude, meddle, or trespass in others’ affairs.

encroach on the rights of others, as in trading without a proper license