Definify.com
Webster 1913 Edition
Blood money
Blood′ monˊey
.1.
Money paid to the next of kin of a person who has been killed by another.
2.
Money obtained as the price, or at the cost, of another’s life; – said of a reward for supporting a capital charge, of money obtained for betraying a fugitive or for committing murder, or of money obtained from the sale of that which will destroy the purchaser.