desafiar
/desaˈfjaɾ/ · B1 · verb
to defy, to challenge
🥊 desafiar = des- (un-) + fiar (to trust), the same root as English defy
Fiar means to trust, from Latin fidere, the root of fidelity. To des-fiar someone was to withdraw your trust and declare yourself their rival. English defy comes from the same source through Old French defier, so desafiar sounds like defy with extra syllables.