vi.

1. 变亮；发亮
   When the storm ended the sky lightened.

   暴风雨过去后，天空变得明亮了。

2. 打闪电

vt.

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

   多点几盏灯会照亮那间阴暗的房间。

2. 使变淡
   The painter lightened the color with white.

   油漆工用白色调淡颜色。

3. 闪电般发出[（+out/forth）]

vt.

1. 减轻（重量、负担等）
   He lightened his bag by taking out some books.

   他从包中取出几本书以减轻重量。

2. 使轻松；使愉快
   Touches of humor lightened the lecture.

   几分幽默使演讲变得生动了。

vi.

1. 变轻
2. 变得轻松；变得愉快
   Her heart lightened when she heard the news.

   她听到那消息，心情就变得愉快了。

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.