1.照亮；发亮
If youlight somethingup or if itlights up, it becomes bright, usually when you shine light on it.

e.g. ...a keypad that lightsup when you pickup the handset...
拿起听筒就会发亮的电话键盘
e.g. On September 5, at the end of the festival, a massive display of fireworks willlightup the sky around Broadlands.
9月5日，也就是庆祝活动的最后，会有大型焰火表演照亮布罗德兰附近的夜空。

2.现出吃惊的神情；露出喜色
If your face or your eyeslight up you suddenly look very surprised or happy.

e.g. Sue's face litup with surprise...
她一脸惊诧。
e.g. You should see his eyeslightup when he talks about home.
你真该看看他谈到家的时候眼睛放光的模样。

3.点烟；开始吸烟
If youlight up, you make a cigarette, cigar, or pipe start burning and you start smoking it.

light up什么意思

e.g. He held a match while she litup...
他拿了根火柴为她点烟。
e.g. He took his time lightingup a cigarette.
他不慌不忙地点了一支烟。

1. 照亮;点(烟)：throwlight on sth. 解释,阐明 |lightup 照亮;点(烟) | makelight of 轻视,藐视

2. 照亮; (脸上)呈现高兴的情绪：eatup 吃光 |lightup 照亮; (脸上)呈现高兴的情绪 | lookup 抬头看; 查找; 好转

3. light up

3. (变亮;使容光焕发)：I will keep this in mind for future reference.(我会记住这个,供以后参考. ) | 6.lightup(变亮;使容光焕发) | Her facelightedup when she heard the news.(听到那个消息,她面露喜色. )

4. 照亮;使放光彩; 点上(烟等)吸起来：translation n.翻译;译文 |lightup 照亮;使放光彩; 点上(烟等)吸起来 | come into being 出现;形成;产生