brighten

sense 1: make lighter or brighter; "The paint will brighten the room"
brighten lighten_up lighten

sense 2: become clear; "The sky cleared after the storm"
clear_up clear light_up brighten

sense 3: become brighter; "The sjy brightened around noon"; "Her face brightened when she heard the good news"
brighten

sense 4: become brighter; "The sky brightened"
brighten lighten