freshen
verb uk/ˈfreʃ.ən/ us/ˈfreʃ.ən/
(AIR)
[ T ] (also freshen up)使洁净，使凉爽
to make something cleaner and/or cooler
She opened a window to freshen up the room. 她打开一扇窗户给屋里换换空气。
[ I ] UK（风）增强变冷
If a wind freshens, it becomes stronger and cooler.
The wind is expected to freshen as it moves in from the east. 预计在自东向西移动的过程中风力会增强。
(DRINK)
[ T ] mainly US (also freshen up)添（尤指酒）
If you freshen someone's especially alcoholic drink, you add more to it.
Here, let me freshen your drink. 来，我给你添点儿酒。
Phrasal verbs
freshen (someone/something) up 梳洗;使干净;使清爽
to make someone or something clean and pleasant
Would you like to freshen up after your journey? 长途跋涉后你要梳洗一下吗？
I'm just going to have a shower to freshen myself up. 我正要冲个淋浴让自己清爽清爽。
freshen something up 使…焕然一新
to make something different and more interesting or attractive
a project to freshen up the town's tired-looking main street 让镇上破旧的主街焕然一新的工程