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English definition of “tyrant”

tyrant

noun [C] uk   /ˈtaɪə.rənt/ us    /ˈtaɪ-/
a ruler who has unlimited power over other people, and uses it unfairly and cruelly: Tamir, one of several sons of the exiled ruler, vowed he would liberate his country from the tyrant.figurative humorous Overnight my boss seems to have turned into a tyrant.
(Definition of tyrant from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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