n.[C]

1. 挫折；失敗；倒退
   But I have had a bad setback.

   可是我遭受了一次大挫折。

   He met with many a setback in his lifetime.

   他一生中遭到過許多挫折。

2. （疾病的）復發
   The patient had a setback in her recovery.

   病在她康復過程中發生了反復。

3. 逆流；渦流
4. 【建】外牆縮進，外牆逐層收進的高樓

n.

1. a reversal or check in progress.
2. Architecture  a plain, flat offset in a wall.
3. N. Amer. the distance by which a building is set back from the property line.