interloper

• n. 不法侵入者；他人の業務に（個人的な利益のために）干渉する者；無許可で営業する者。

intruder（侵入者）の語源はleap、elopeと同じ。

interloper

interloper: [16] An interloper is literally someone who ‘runs between’. The word was coined in English, but based on Dutch loper, a derivative of lopen ‘run’ (to which English leap is related). It originally denoted someone who engaged in trade without authorization, and only in the 17th century took on its present-day meaning ‘interfering outsider’.
=> leap

interloper (n.)

1590s, enterloper, "unauthorized trader trespassing on privileges of chartered companies," probably a hybrid from inter- "between" + -loper (from landloper "vagabond, adventurer," also, according to Johnson, "a term of reproach used by seamen of those who pass their lives on shore"); perhaps a dialectal form of leap, or from Middle Dutch loper "runner, rover," from lopen "to run," from Proto-Germanic *hlaupan "to leap" (see leap (v.)). General sense of "self-interested intruder" is from 1630s.

1. She felt like an interloper in her own family.

彼女は自分の家ではよそ者のように感じている。

2.In the constituencies of Great Britain she was still an interloper -cold，affected，and unacceptably right wing.

大ブリテン国内の各選挙区では、人々は依然として彼女を途中から飛び出してきた見知らぬ人と見なしている--冷たく、こせこせした極右派。

3.Both creatures shrunk back into the rocks，even though Judith 's attention was fixed on the interloper .

今でもジュディスの注意力は侵入者に完全に引きつけられているが、彼ら2人は思わず石の山に戻ってしまった。

4.Pauline is conniving interloper ，befriending the lonely wife while the husband is busy working.

ポーリンはデフォルトの第三者で、夫が仕事に追われている間に孤独な妻の世話をする。