desafío
/desaˈfio/ · B1 · noun · m
challenge
🥊 des- (un-) + fiar (to trust): you un-trust someone, so you challenge them
Desafiar originally meant to break a bond of trust or loyalty, and that act was a declaration of hostility. Today un desafío is any challenge, from a duel to a hard exam. It is masculine: el desafío. Related words: fiar (to trust) and confiar (to rely on).