blood money

  1. money paid to a hired killer
  2. money paid as compensation to the next of kin of a murdered person; wergeld
  3. money gotten ruthlessly at the expense of others' lives or suffering

See blood money in American Heritage Dictionary 4

noun
  1. Money paid by a killer as compensation to the next of kin of a murder victim.
  2. Money gained at the cost of another's life or livelihood.
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