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Use "off-book" in a sentence
"For one thing, it appears to me that Fred is complaining about off-book spending."
"As such, many people come to Saudis asking for them to fund their projects, off-book."
"Senator Cantwell then stated that "Americans want to know when Congress will put an end to the Wall Street's secret off-book gambling schemes and restore our capitalist system by requiring real transparency and true competition.""