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rotter

noun [C]
 
/ˈrɒt.ər/ US  /ˈrɑː.t̬ɚ/ mainly UK old-fashioned

Definition

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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