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In a sentence
Auto bolo nalakované načierno.
The car was painted black.
Stenu natreli načierno.
They painted the wall black.
Pracoval načierno bez zmluvy.
He worked illegally without a contract.
Fotografiu vytlačili načierno.
They printed the photograph in black.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.