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English definition of “rotter”

rotter

noun [C]     /ˈrɒt.ər/ US  /ˈrɑː.t̬ɚ/ mainly UK old-fashioned
someone who is very unpleasant or does very unpleasant thingsUnpleasant people in generalUnpleasant men
(Definition of rotter noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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