verb
to intrude or interfere in a situation or activity in which one does not belong
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The businessman was accused of being an interlope in the company's dealings.
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I heard that new guy is an interlope who doesn't really fit in with the team.
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Don't be such an interlope and try to join our group without an invitation.
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The invasive species was like an interlope in the ecosystem, disrupting the natural balance.