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In a sentence
to secure
Bezpečnostná služba zaistila vstup.
The security service secured the entrance.
to ensure
Potrebujeme zaistiť dostatok potravín.
We need to ensure enough food.
Other
Organizátori zaistili bezpečnosť na festivale.
The organizers secured safety at the festival.
Treba zaistiť, aby všetci dostali informáciu.
We need to ensure that everyone receives the information.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.