All 6 Uses

black market
in
The Boy on the Wooden Box
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He also made arrangements with his gentile friend Wojek to sell a few of his fine suits on the black market.†
p. 69.9 *

black market = the coming together of people who buy and sell things illegally
Because the candles were nearly impossible to find even on the black market, she blew them out immediately after the prayers.†
p. 75.3
Sometimes food was available on the black market, but one had to have something to exchange.†
p. 86.9
When we were most desperate, Father once again asked his friend Wojek, who lived outside the ghetto, to sell one on the black market.†
p. 87.8
With money from black market dealings, he bought a piece of land adjacent to his Emalia factory, built the barracks, and persuaded Commandant Goeth with smooth talk and substantial amounts of money that having his workers nearby would increase productivity.†
p. 202.4
In 1943, Oskar Schindler was arrested and briefly jailed for his black market activities.†
p. 203.4

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)