surety
/ˈʃɔ:rətɪ; ?@ ˈʃuərtɪ; `ʃʊrtɪ/ n[C, U]
1 (money, etc given as a) guarantee that sb will pay his debts, perform a duty, etc 担保; 保证; 保证金; 担保品
offer 100 as
(a) surety 愿出100英镑作保证金.
2 person who makes himself responsible for the payment of debts, etc by sb else 担保人; 保证人
stand (ie act as a) surety for sb 做某人的担保人.