interloper
UK: ˈɪntələʊpə | US: ˈɪntərloʊpər
n. a person who becomes involved in a place or situation where they are not wanted or are considered not to belong
n. (historical) a trader operating unlawfully in a market without a license
The word "interloper" originated in the late 16th century, combining "inter-" (Latin for "between") and "lope" (an archaic term meaning "to run," derived from Middle Dutch "lopen"). The "-er" suffix denotes an agent. Originally, it referred to unauthorized traders who "ran between" established markets, violating trade monopolies. Over time, it broadened to describe any intrusive person. The morphemes reflect the word's literal and historical roots while preserving its modern spelling.
The meeting was interrupted by an unwelcome interloper.
Colonial powers often punished interlopers who traded without permission.
She felt like an interloper at the exclusive party.
Wildlife cameras detected an interloper in the protected forest.
The startup accused the corporation of being an interloper in their niche market.