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English definition of “collaborationist”

collaborationist

adjective uk   /kəˌlæb.əˈreɪ.ʃən.ɪst/ disapproving us  
describes a person or group who works with an enemy who has taken control of their country: a collaborationist governmentDisloyalty, betrayal and treason
(Definition of collaborationist from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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