lighten

verbs

make more cheerful
"the conversation lightened me up a bit"
antonym
reduce the weight on; make lighter
"she lightened the load on the tired donkey"
is a type of (narrower)
take the burden off; remove the burden from
"unburden the donkey"
become more cheerful
"after a glass of wine, he lightened up a bit"
make lighter or brighter
"The paint will brighten the room"
become lighter
"The room lightened up"
antonym
alleviate or remove (pressure or stress) or make less oppressive
"relieve the pressure and the stress"; "lighten the burden of caring for her elderly parents"