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off-the-books

[ awf-thuh-books, of- ]
/ ˈɔf ðəˈbʊks, ˈɒf- /
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adjective
not recorded in account books or not reported as taxable income.
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Which of the following colors is used to symbolize AIR?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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