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The term "Closure Costs" for the purposes of this letter agreement means the reasonable costs to be incurred by HASL, and which cannot be met from funds otherwise available to AA, in order to close new business and to set up reserves and meet the Minimum Solvency Requirement to run-off the closed portfolio of the business.

AA是保险公司，怀疑黄色部分的run-off应该是run off，问题是保险里"run off某项业务"是什么意思？

多谢各路神仙！