an air/room 'freshener' [=something used to make the air in a room smell fresher or more pleasant]
We tried to 'freshen' (up) the room [=to give the room a brighter appearance] with some color.
After my walk, I 'freshened up' with a shower.
(..) -Yes. Well, it was really good seeing you ladies. Bye. Excuse me. Where do you think you're going? To go freshen up. The Hamptons Magazine reception just started, so let's hit it. Hey, check it out. Are those the Wilson sisters? More like the Wilt Chamberlain sisters. (..)2004 White Chicks