Polish

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Etymology

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Literally, in black.

Pronunciation

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Adverb

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na czarno (not comparable)

  1. (economics, idiomatic) illegally, off the books, under the table (informally, without reporting to the government)
    pracować na czarnoto work illegally
    dorabiać na czarnoto moonlight illegally
    zatrudniać na czarno'to hire illegally
  2. Used other than figuratively or idiomatically: see na,‎ czarno.

Further reading

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  • na czarno in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
  • na czarno in Polish dictionaries at PWN