Verbs

(v)lighten, lighten up, buoy upmake more cheerful“the conversation lightened me up a bit”
(v)lighten, lighten up, buoy upbecome more cheerful“after a glass of wine, he lightened up a bit”
(v)brighten, lighten up, lightenmake more cheerful through the use of color“The paint will brighten the room”
(v)lighten, lighten upbecome lighter“The room lightened up”