lighten

verb

1. make more cheerful"the conversation lightened me up a bit"
2. reduce the weight on; make lighter"she lightened the load on the tired donkey"
3. become more cheerful"after a glass of wine, he lightened up a bit"
4. make more cheerful through the use of color"The paint will brighten the room"
5. become lighter"The room lightened up"
6. alleviate or remove (pressure or stress) or make less oppressive"relieve the pressure and the stress"