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Wiktionary
freshen up

vb. 1 (context intransitive English) to wash or groom oneself in order to be more attractive 2 (context transitive English) to freshen, make fresh, revivify, make new.

WordNet
freshen up
  1. v. make brighter and prettier; "we refurbished the guest wing"; "My wife wants us to renovate" [syn: refurbish, renovate]

  2. become or make oneself fresh again; "She freshened up after the tennis game" [syn: freshen, refresh, refreshen]

Usage examples of "freshen up".

I went in to freshen up, and all I could think was I was going to have amazing sex with this perfect man.

She needed to freshen up more than she needed to worry about her modesty.

Afterward I was exhausted, and the orgy I had started was going strong, but some of the girls and guys went for a swim to freshen up and cool off, and there I ran into my companion, Norman.

I don't know about you, but I'm going out to do a little shopping, and then freshen up for dinner.

Time to use the washroom, freshen up, have breakfast, and take a cab to the center of London’.