lighten, lighten up, buoy up -- (make more cheerful; "the conversation lightened me up a bit")
lighten -- (reduce the weight on; make lighter; "she lightened the load on the tired donkey")
lighten, lighten up, buoy up -- (become more cheerful; "after a glass of wine, he lightened up a bit")
brighten, lighten up, lighten -- (make lighter or brighter; "The paint will brighten the room")
lighten, lighten up -- (become lighter; "The room lightened up")
relieve, lighten -- (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")