vouch [vouched, vouching, vouches](to express confidence in or take responsibility for (the correctness or truth of) something) verb [UK: vaʊtʃ] [US: ˈvaʊtʃ]
担保 /dānbǎo/ noun
collateral [collaterals](security or guarantee) noun [UK: kə.ˈlæ.tə.rəl] [US: kə.ˈlæ.tə.rəl]