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investment-grade debt UK US noun [U] FINANCE
► the type of bond or other loan that has a low risk of not being paid back: »
The company in May sold $3.5 billion of bonds in a record investment-grade debt sale, and then issued $1.5 billion more a month later.
»It is feared that the company will lose the critical investment-grade debt rating from at least one rating agency.
Financial and business terms. 2012.