lighten up

(verb) make more cheerful. Synonyms: lighten, lighten up, buoy up. Example: "The conversation lightened me up a bit."

(verb) become more cheerful. Synonyms: lighten, lighten up, buoy up. Example: "After a glass of wine, he lightened up a bit."

(verb) make lighter or brighter. Synonyms: brighten, lighten up, lighten. Example: "The paint will brighten the room."

(verb) become lighter. Synonyms: lighten, lighten up. Example: "The room lightened up."