a.

1. （被云等）遮蔽的；多云的，阴的
   The sky became suddenly overcast with clouds.

   乌云密布，天空突然暗下来。

2. 沮丧的；忧郁的；情绪低落的
   His handsome countenance was overcast.

   他那英俊的面容阴沉沮丧。

3. 包边缝纫的，缝边的

vt.

1. （云等）遮蔽（天空等），使阴
   The smoky haze overcast the distant mountains.

   烟雾笼罩着远处的群山。

2. 使沮丧；使忧郁
   The existence of evil overcasts life.

   邪恶的存在使人生变得阴暗。

3. 包缝（边）

vi.

1. 变多云，变阴
   It began to overcast.

   天开始变阴了。

2. 变得沮丧（或忧郁）

n.[U]

1. 阴，阴天
   All day today there was a heavy overcast.

   今天一整天都是阴天。

2. 沮丧；忧郁

adj.

1. (of the sky or weather) cloudy; dull.
2. edged with stitching to prevent fraying.

n.

v.

1. cover with clouds or shade.
2. stitch over (a raw edge) to prevent fraying.