To fetch again so what is shown matches what is. Refreshing trades effort for currency.
Old French refreschir: re- (again) + freis (fresh), of Germanic origin (Frankish frisk); to refresh is to make a thing fresh again, fetched anew rather than kept as it was.
To fetch again so what is shown matches what is. The root's making-fresh trades effort for currency, exactly the exchange a refresh still makes every time it runs.