アングラマネー

noun

underground money; illegal funds

Abbreviation of 'underground money'; refers to money used in illegal or hidden financial activities, such as bribery, tax evasion, or organized crime.

• その事じ件けんにはアングラマネーが絡からんでいるらしい。

  It seems that underground money is involved in that case.

• アングラマネーの流ながれを追おうのは難むずかしい。

  It's difficult to trace the flow of illegal funds.