v. 25B6; verb
sunshine brightened the room : ILLUMINATE, light up, lighten, make bright, make brighter, cast/shed light on.
you can brighten up the shadiest of corners : ENHANCE, embellish, enrich, dress up, prettify, beautify; informal jazz up.
Sarah brightened up as she thought of Emily's words : CHEER UP, perk up, rally; be enlivened, feel heartened, be uplifted, be encouraged, take heart; informal buck up, pep up.