dead money
n.— «Feeley was scheduled to make $2.4 million in contractual salary from the Eagles in 2009 if he made the roster. If he were to be released prior to the season opener, he would receive a $1 million buyout in what is known as “dead money” in the NFL.» —“Ex-Eagle QB’s For Sale….and how much money is an NFL job worth?” by Thomas Jackson Most Valuable Network: Eagles Eye Sept. 7, 2009. (source: Double-Tongued Dictionary)
Further reading
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While reading Great Expectations (Bookshop|Amazon) by Charles Dickens, a listener in Arlington, Texas, is surprised when one of the characters inherits some money, which Dickens describes as a cool four thousand. Were they really using cool that way...
dead money is also used in poker as “lost money”