a.

1. 快速的，快捷的
   The river is too swift to swim.

   这河水流太急，不能游泳。

2. 立刻的，实时的
   I noticed a swift change of expression in his face.

   我注意到他脸上的表情很快地变化。

3. （行动）快的[F][+to-v]
   He is swift to take steps.

   他很快采取措施。

   He is swift to take offence.

   他动辄生别人的气。

ad.

1. （多用于构成合成词）实时地，迅速地

n.

1. 褐雨燕[C]

adj.

1. happening quickly or promptly.
2. moving or capable of moving at high speed.

adv.

n.

1. a fast-flying insectivorous bird with long, slender wings, spending most of its life on the wing. [Apus apus (Eurasia) and other species, family Apodidae.]
2. a moth, typically yellow-brown, with fast darting flight. [Family Hepialidae.]
3. a light adjustable reel for holding a skein of silk or wool.