freshen(Informal)[verb]Synonyms: refresh, enliven, freshen up, liven up, restore, revitalize 
 [TahlilGaran] English Synonym Dictionary ▲
 fresh‧en /ˈfreʃ
ən/ 
 verb [
Word Family: noun: 
freshness, 
refreshment, refreshments, refresher; 
adverb: 
freshly, freshingly, 
refreshingly; 
adjective: 
fresh, 
refreshing, 
refreshed; 
verb: 
freshen, 
refresh]
1.  (
also freshen up)
 [transitive] to make something look or feel clean, new, attractive, cool etc
 Synonym : brighten (up): 
 I’m going to buy some white paint to freshen up the bathroom walls.2.  [intransitive] if the wind freshens, it gets colder and stronger
3.  (
also freshen up)
 [transitive] to add more liquid to a drink: 
 The waitress freshened our coffee.freshen up phrasal verb to wash your hands and face in order to feel clean and comfortable
freshen yourself up
 Fiona’s gone to freshen herself up.  [TahlilGaran] Dictionary of Contemporary English ▲