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In a sentence
Čo nás nezabije, to nás posilní.
What doesn't kill us makes us stronger.
Nové pravidlá posilnili bezpečnosť na pracovisku.
The new rules strengthened workplace safety.
Táto skúsenosť ma posilnila.
This experience strengthened me.
Krátky oddych posilní tvoju koncentráciu.
A short rest will strengthen your concentration.
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.