Depletion of a tax shelter's benefits. In the context of mortgage backed securities it refers to the percentage of the pool that has prepaid their mortgage. Bloomberg Financial Dictionary
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burnout burn‧out [ˈbɜːnaʊt ǁ ˈbɜːrn-] noun [countable]
1. HUMAN RESOURCES a feeling of extreme tiredness and lack of energy caused by working too hard:
• With longer vacations you would see less burnout and higher productivity.
2. when people stop doing something because they are tired of doing it or feel they have been asked to do it too much:
• Donor burnout grows as requests for money increase and fewer people can afford to give.
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burnout UK US (UK also burn-out) /ˈbɜːnaʊt/ noun [U]
► HR extreme tiredness or a feeling of not being able to work any more, caused by working too hard: »
Long and unpredictable work hours have led to burnout and frustration.
Financial and business terms. 2012.