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challenge

Examples
In a sentence
Bude to výzva.
It's gonna be a challenge.
Nová práca je pre ňu zaujímavá výzva.
The new job is an interesting challenge for her.
Na výzvu organizátorov sa prihlásili stovky ľudí.
Hundreds of people responded to the organizers' call.
Nová výzva na granty sa otvára v marci.
A new grant call opens in March.
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Includes Tatoeba example sentences when present.
Full attribution on References.