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.
(..) you don't have to see me out. All right, see you tomorrow. He must have been hiking the whole time. He looks wonderful. Excuse me. I just have to freshen up my hair. Be right back. Have you swallowed your marzipan yet? - Hello? - So, you're back. I am no hologram. (..)2004 TvShow: Gilmore Girls Title: The Nanny and the Professor Season: 4 Episode 10