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English definition of “two-timer”

two-timer

noun [C]     /ˈtuːˌtaɪ.mər/ US  /-mɚ/ informal
a person who deceives their partner by having a secret sexual relationship with someone elseDisloyalty, betrayal and treasonInfidelity in relationships
(Definition of two-timer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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