1col·lat·er·al 
/kəˈlætərəl/ noun
/kəˈlætərəl/ noun [noncount] : something that you promise to give someone if you cannot pay back a loan
▪ She put up her house as collateral for the loan. [=she agreed that she would give up her house if she did not repay the loan]
▪ She put up her house as collateral for the loan. [=she agreed that she would give up her house if she did not repay the loan]
