freshen up
1. To improve one's appearance, typically by making quick changes to one's makeup, clothing, etc. A noun or pronoun can be used between "freshen" and "up." Can you excuse me for a moment? I'd like to freshen up before dinner.
2. To improve the appearance of something. A noun or pronoun can be used between "freshen" and "up." I think that a new coat of paint will freshen this room right up.
freshen someone or something up
to revive or restore the appearance or vitality of someone or something. What can we do to freshen this room up? A cold shower freshened up the runner.
freshen up
to get cleaned up, rested up, or restored. I need a few minutes to freshen up before dinner.
freshen up
v.1. To clean oneself, rearrange one's clothing, or reapply makeup: I went upstairs to freshen up quickly before we left for the party.
2. To rearrange or renew something in order to make it more attractive or comfortable: Putting new pillows on the couch really freshened the room up. I freshened up the apartment by making new curtains.