From Longman Dictionary of Contemporary EnglishI defy somebody to do somethingI defy somebody to do somethingASK FOR something/ASK somebody TO DO something spoken formal used when you ask someone to do something that you think is impossible I defy anyone to prove otherwise. → defy
Examples from the Corpus
I defy somebody to do something• Derbyshire folk may query the authenticity of this but I defy them not to enjoy the results.• Willing my heart to beat normally, I defy the urge to turn back or freeze or cry out. 