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Definition

defy verb

/dɪˈfaɪ/ v [T]
to refuse to obey a person, decision, law, situation, etc.
children openly defying their teachers
A few workers have defied the majority decision and gone into work despite the strike.
The fact that aircraft don't fall out of the sky always seems to me to defy (= act against) the law of gravity.
A forest fire raging in the south of France is defying (= is not changed by) all attempts to control it.

defy belief/description/explanation

to be extreme or very strange and therefore impossible to believe, describe or explain
The chaos at the airport defies description.

defy sb to do sth

to tell someone to do something that you think will be impossible
I defy you to prove your accusations.
I defy you to tell where I've painted over the scratch on my car.

(Definition of defy verb from the Cambridge Advanced Learner's Dictionary)
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