What does "defy" mean?
A challenge.
noun, verb ·Common ·High school level
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"And, safe intrench'd within, her foes without defies"
"to defy an enemy; to defy the power of a magistrate; to defy the arguments of an opponent; to defy public opinion"
"If you defy your teacher you may end up in detention."
"By tossing this nineteenth electron back and forth between its own orbit and that of its lost companion more than twenty-five thousand times a second, a mutilated stone atom is able partially to defy gravity and thus successfully to ride the emerging streams of light and energy, the sunbeams, to liberty and adventure."
"1603-1625, Beaumont and Fletcher For thee I have defied my constant mistress."
"I defy you to solve the problem."
A challenge.
Common synonyms include: resist, affront, affronting, affronts, attack, baffle.
I defy you to solve the problem.
Pronounced /dɪˈfaɪ/.
From Old French desfier, from Vulgar Latin *disfidare (“renounce one's faith”), from Latin dis- (“away”) + fidus (“faithful”). Meaning shifted in the 14th century from "be disloyal" to "challenge". Contrast confide, fidelity, faith.