Definitions

1. verb

to make something feel or seem cool and refreshing; to make something cleaner or less stale

“She went out to get some fresh air to freshen up her mood.”

2. verb

to make something newer or more modern

“The new renovation will freshen up the old building.”

3. noun

the act of making something feel or seem cool and refreshing

“The freshen in the air helped to calm her down.”