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English definition of “interloper”

interloper

noun [C] uk   /ˈɪn.təˌləʊ.pər/ us    /-t̬ɚˌloʊ.pɚ/ disapproving
someone who becomes involved in an activity or a social group without being asked, or enters a place without permission: Security did not prevent an interloper from getting onto the stage at the opening ceremony.
(Definition of interloper from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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