Simple past tense and past participle of defy.(verb)
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Use "defied" in a sentence
"Her expression defied him, invited him to counter her."
"In a state where President Obama remains deeply unpopular, Manchin defied a tough environment to keep a key Senate seat safely in the Democratic column."
"Brady and the Patriots again defied the odds and won a postsesason game with a critical drive in crunchtime."