black money—
1. money not declared for tax purposes (by casino operators, etc.):
- Erlich has also promised an amnesty for those who reveal their black money and pay a tax on it.
2. money paid to workman handling dirty materials or working in dirty conditions:
- When any class of work involves special unpleasantness, “black money” or “dirty money” is sometimes stipulated for.
white money—(arch.) standard silver coins:
- Rutland pays to the King one hundred and fifty pounds white money.
See also: pink money / red money.