Also means
dare
Usage Note
Reto can mean a formal challenge or dare (its older sense) and, very commonly in modern Spanish, any difficult goal or task (un gran reto profesional). This motivational use is very frequent in business and sports contexts. The verb is retar (to challenge).
Examples
"Aprender un idioma es siempre un gran reto."
Natural Translation
Learning a language is always a great challenge.

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