also: やみしじょう
noun
Refers to an illegal market where goods are traded in violation of official regulations, often during shortages or prohibition.
戦後、多くの人が闇市場で食料を手に入れた。
After the war, many people obtained food on the black market.
その国では外貨が闇
In that country, foreign currency is traded at high prices on the black market.
Compound of 闇 (yami, 'darkness; illegal') and 市場 (ichiba/shijō, 'market'). The reading いちば is the native Japanese reading of 市場, while しじょう is the Sino-Japanese reading.