Definition of “tyrant” - English Dictionary

british dictionary

“tyrant” in British English

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tyrantnoun [ C ]

uk /ˈtaɪə.rənt/ us /ˈtaɪ.rənt/

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 Learner's Dictionary & Thesaurus © Cambridge University Press)