vi.

1. 变得新鲜；变得精神焕发[（+up）]
   I took a shower to freshen up.

   我冲个澡以振作一下精神。

2. （风）变强；（天气）变凉爽

vt.

1. 使新鲜；使精神焕发；使清新[（+up）]

v.

1. make or become fresh.
   ▸ (freshen up) refresh oneself by washing oneself or changing one's clothes.
2. (of wind) become stronger and colder.
3. chiefly N. Amer. top up (a drink).