refreshen vs freshen up

refreshen and freshen up both are verbs.

Word	Noun	Adjective	Verb	Adverb
refreshen	No	No	Yes	No
freshen up	No	No	Yes	No

As verbs, refreshen and freshen up are synonyms defined as:

Other synonyms of refreshen include freshen, refresh.

refreshen (verb)	freshen up (verb)
become or make oneself fresh again	become or make oneself fresh again
make fresh again	make brighter and prettier