n.

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

   他给我一块表作为担保。

   stand surety for somebody

   为某人担保

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.