1 money given as a promise that you will pay a debt, appear in court, etc 保证金: She was granted bail with a surety of $500. 她交了 500 元保证金，获得保释。 They have offered a large amount of money as surety. 他们提供了一大笔钱作为保证金。

2 a person who accepts responsibility if sb else does not pay a debt, appear in court, etc 保证人；担保人: to act as surety for sb 为某人做担保人She has promised to stand surety for $5,000.她已许诺担保5 000元。