regarded the new couple as a pair of interloping parvenus who were sure to upset the town's social hierarchy
Recent Examples on the WebCorinne always unrolls her mat in the back corner, tries not to interlope. Rebecca Makkai, Harper's Magazine, 17 Aug. 2021 Even my mother, an expert in detecting interloping odors, couldn’t catch anything. Luke Winkie, Vox, 5 Aug. 2019 And so Beyonce wanting to be in that just seemed like interloping. Joy-ann Reid, Cosmopolitan, 13 Feb. 2018 Europeans are taught a history of migration from birth, of Greeks and Romans spreading over Europe, conquering lands, and interloping afar. Adam Rutherford, The Atlantic, 3 Oct. 2017
Word History
Etymology
probably back-formation from interloper, from inter- + -loper (akin to Middle Dutch lopen to run, Old English hlēapan to leap) — more at leap