fresh·en 
(frĕshən)
(frĕshən)v. fresh·ened, fresh·en·ing, fresh·ens
v.intr.
1. To become fresh, as in vigor or appearance: freshened up after the day's work.
2. To become brisk; increase in strength. Used of the wind.
3. To lose saltiness.
4. To calve and therefore begin to produce milk. Used of a cow.
v.tr.
1. To make fresh.
2. To add to or strengthen (a drink).
freshen·er n.