Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: inter- + -loper (perhaps from Old English hleapan 'to jump' or Middle Dutch lopen 'to run')

interloper

 noun
     
in‧ter‧lop‧er [countable]
someone who enters a place or group where they should not be
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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