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.
(..) This is Natalie. I should give you both a moment. No. No, that's fine. I'm fine. It's a pleasure to meet you. Maybe we should just all go up to our rooms and freshen up. Or maybe a drink? Now you're talking. He broke up with you over text message? It's kind of like firing someone (..)2009 Up in the Air