lighten up
    v 1: make more cheerful; "the conversation lightened me up a
         bit" [syn: lighten, lighten up, buoy up] [ant: weigh
         down, weigh on]
    2: become more cheerful; "after a glass of wine, he lightened up
       a bit" [syn: lighten, lighten up, buoy up]
    3: make lighter or brighter; "The paint will brighten the room"
       [syn: brighten, lighten up, lighten] [ant: darken]
    4: become lighter; "The room lightened up" [syn: lighten,
       lighten up] [ant: darken]