brighten

bright|en [ `braıtn ] verb

1. ) brighten or brighten up intransitive to start to have more color or light:

The sky slowly brightened.

a ) transitive to give something more color or light:

Light colors brighten a dark room.

2. ) brighten or brighten up intransitive to start looking or feeling happier:

She frowned anxiously, then suddenly her face brightened.

a ) brighten (up) someone's day/life to make someone feel happier

,brighten `up phrasal verb

1. ) intransitive or transitive same as BRIGHTEN 1:

You could brighten up that skirt with a red blouse.

I think the sky's brightening up.

2. ) intransitive or transitive same as BRIGHTEN 2:

Sarah brightened up considerably as she thought of Emily's words.

3. ) intransitive if the weather brightens up, it becomes sunnier