vi.

1. 變亮；發亮
   When the storm ended the sky lightened.

   暴風雨過去後，天空變得明亮了。

2. 打閃電

vt.

1. 使光明，照亮
   More lamps will lighten the gloomy room.

   多點幾盞燈會照亮那間陰暗的房間。

2. 使變淡
   The painter lightened the color with white.

   油漆工用白色調淡顏色。

3. 閃電般發出[（+out/forth）]

vt.

1. 減輕（重量、負擔等）
   He lightened his bag by taking out some books.

   他從包中取出幾本書以減輕重量。

2. 使輕鬆；使愉快
   Touches of humor lightened the lecture.

   幾分幽默使演講變得生動了。

vi.

1. 變輕
2. 變得輕鬆；變得愉快
   Her heart lightened when she heard the news.

   她聽到那消息，心情就變得愉快了。

v.

1. make or become lighter in weight.
2. make or become less serious.

v.

1. make or become lighter or brighter.
2. (it lightens, it is lightening, etc.) rare flash with lightning.
3. archaic enlighten spiritually.