Simple past tense and past participle of tyrannise. (verb)
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Use "tyrannised" in a sentence
"If you believe the more excitable conservative papers, we live in a country tyrannised by health and safety fanatics."
"The problem lies in being unable (or unwilling) to distinguish which groups are genuinely oppressed and tyrannised (is that a word?) - they all get lumped together: Tibet, Darfur, South Africa, Palestine ... all seen as victims of evil imperial powers."
"The Fellah must either tyrannise or be tyrannised over; he is never happier than under a strong-handed despotism and he has never been more miserable than under British rule, or rather, misrule."