This is the 715th most frequent Ukrainian word.
чорному
"Чорному" means "black" in the dative or prepositional case in Ukrainian.
Adjective describing the color of the paper.
Я написав це на чорному папері.
I wrote it on black paper.
Adverbial phrase indicating illicit or informal activity.
Він працював неофіційно, по чорному.
He worked unofficially, under the table.
Noun indicating an object, described by its black color.