lighten

Make more cheerful.

“the conversation lightened me up a bit”

Become lighter.

“The room lightened up”

Make more cheerful through the use of color.

Become more cheerful.

“after a glass of wine, he lightened up a bit”

Alleviate or remove (pressure or stress) or make less oppressive.

“lighten the burden of caring for her elderly parents”

Reduce the weight on; make lighter.

“she lightened the load on the tired donkey”