from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A debt harshly insisted upon.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Something which is owed and which will be hurtful or difficult to provide; a debt owed to someone who is merciless and demanding.
From Antonio's debt to Shylock in The Merchant of Venice by William Shakespeare.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Shakepeare's The Merchant of Venice, in which Antonio literally owes a pound of his flesh to the moneylender Shylock. (Wiktionary)