The phrase "new collateral" refers to something valuable that is being offered as security for a loan or a debt, and it is something that has not been used as collateral before. Full definition
Rating agencies are encouraged to rate new structures and new collateral types, whether they have good data or not. (alephblog.com)
Neovasculgen led to the development of new collateral blood vessels which was contrasted on angiography. (hematopoiesis.info)
Estradiol's benefits appear related to activation of Endothelial Progenitor Cells which invoke new collateral circulation in areas of injury. (jeffreydachmd.com)