the.com/collateral

the promise you put on the line when your word alone isn't enough

means Something of value pledged to a lender as security for a loan, which they can seize if you fail to repay; more broadly, anything running alongside the main thing — a side effect, a parallel asset, or accompanying damage.

from From Medieval Latin collateralis, stitched together from com- 'together' and lateralis 'of the side' (from latus, 'side' — the same root behind 'lateral'). So at heart it means 'side by side': two things running parallel. The financial sense — property set alongside a debt as backup — is the lawyer's gift, while 'collateral damage' borrows the same idea of harm that happens off to the side of the intended target.

latin roots
From 'col' plus 'lateralis' — alongside, off to the side
banking spine
Roman lenders demanded property pledges over two thousand years ago
grim euphemism
'Collateral damage' rebrands dead civilians as accounting
the irony
You only lose it if you can't pay anyway
home edition
Your house is the bank's hostage for thirty years
for instance

pledge of stock shares — common practice where investors use their stock portfolio as security for loans

letter of credit banking — guarantee issued by banks to secure international trade transactions and payment obligations

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