"to make less heavy," figuratively "to make cheerful," mid-14c., from light (adj.1) + -en (1). Related: Lightened; lightening.
lighten (v.2)
"shed light upon, illuminate, brighten," early 14c., from light (n.) -en (1). Meaning "to grow brighter" is late 14c. Of faces, expressions, etc., from 1795. Related: Lightened; lightening.
权威例句
1. He managed to lighten the generally lifeless debate at times.
他让这场总体很沉闷的辩论时不时迸出了些火花。
2. An efficient bulb may lighten the load of power stations.
一个节能灯泡也许就能减轻发电站的负荷。
3. In sharing this secret you lighten your burden.
和别人分享这个秘密可以减轻自己的负担。
4. Anthony felt the need to lighten the atmosphere.