Distorting the price feed a protocol relies on, so that the protocol values collateral or debt incorrectly and can be exploited at that valuation.
Why it matters
Protocols reading a spot price from a single venue are most exposed, because that price can be moved within one transaction. Time-weighted averages and multiple independent sources raise the cost of the attack.
Not advice. Definitions are for understanding, not instruction. Nothing here is financial, legal, tax or security advice.