Meaning of “arch-enemy” in the English Dictionary

british dictionary

"arch-enemy" in British English

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arch-enemynoun [ C ]

uk /ˌɑːtʃˈen.ə.mi/ us /ˌɑːrtʃˈen.ə.mi/

(Definition of “arch-enemy” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)