What is the verb form of word fresh?

There isn't a single verb form of the word "fresh." However, depending on the context, you could use these verbs:

* Freshen: This means to make something fresh again.

* Example: "I need to freshen up before the meeting."

* Refresh: This means to make something fresh or new again.

* Example: "I'll refresh your drink."

* Renew: This means to make something fresh or new.

* Example: "He renewed his vows."

* Revitalize: This means to make something fresh and full of life again.

* Example: "The new CEO revitalized the company."

The best verb to use will depend on the specific meaning you are trying to convey.