money given as a promise that you will pay a debt, appear in court, etc. 保证金 a person who accepts responsibility if somebody else does not pay a debt, appear in court, etc. 保证人；担保人 to act as surety for somebody 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。
Word OriginMiddle English (in the sense ‘something given to support an undertaking that someone will fulfil an obligation’): from Old French surte, from Latin securitas, from securus ‘free from care’, from se- ‘without’ + cura ‘care’.