All 7 Uses

black market
in
Anne Frank, the Diary of a Young Girl - Definitive Edition
(Edited)

We also purchase ration books on the black market.
p. 68.7 *

black market = where things are bought and sold illegally
According to the newspaper, everyone is entitled to half a pound, but they mean those lucky souls who get their ration books from the government, not Jews in hiding like us who can only afford to buy four rather than eight ration books on the black market.
p. 85.7

black market = the coming together of people who buy and sell things illegally
The black market is doing a booming business.
p. 93.7
Maybe Miep will be able to scrounge up something on the black market.
p. 97.6
He talked about his life at home, the black market and how he felt like a worthless bum.
p. 206.9
50 guilders on the black market.
p. 265.1
Everyone's trading on the black market; every errand boy has something to offer.
p. 306.5

black market = where people buy and sell things illegally

Definitions:

(1) (black market)
an illegal market that trades in illegal goods, stolen goods, or goods sold illegally to avoid tax payments, licensing requirements, or rationing
(2) (meaning too rare to warrant focus)