n.

1. 保證，擔保；擔保人；擔保物[U][C]
   He gave me a watch as surety.

   他給我一塊表作為擔保。

   stand surety for somebody

   為某人擔保

2. 信心，自信[U][S1]

n.

1. a person who takes responsibility for another's undertaking, e.g. the payment of a debt.
2. money given as a guarantee that someone will do something.
3. the state of being sure.