n.

1. 黑暗；阴暗；昏暗[U]
   His future seemed filled with gloom.

   他的前程似乎黯淡无光。

2. 【书】暗处；多阴的地方[C]
3. 忧郁的心情；沮丧的气氛[U][S1]
   His death cast a gloom over the country.

   他的死给这个国家蒙上了一层阴影。

vi.

1. 变阴暗，变阴沉
2. 显得闷闷不乐；感到沮丧[（+about/over）]
   He gloomed all day yesterday.

   昨天他整日闷闷不乐。

vt.

1. 使暗；使阴沉
2. 使忧郁
3. 忧郁地表示

n.

1. partial or total darkness.
2. a state of depression or despondency.

v.