The Collaborative International Dictionary
Interloping
Interlope \In`ter*lope"\, v. i. [imp. & p. p. Interloped; p. pr. & vb. n. Interloping.] [See Interloper.] 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.
Wiktionary
interloping
n. 1 An act of intrusion or encroachment. 2 (context historical English) Illegal Indian trade within the area over which the (w: Hudson's Bay Company) held a trade monopoly. vb. (present participle of interlope English)