This is the 1554th most frequent German word.
frischen
"Frischen" means "to freshen" or "to refresh."
Here, 'frischen' is used as an adjective to describe 'Brötchen' (bread rolls), indicating their state of freshness.
Ich werde die frischen Brötchen vom Bäcker holen.
I will fetch the fresh bread rolls from the baker.
In this sentence, 'frische' (a form of 'frischen') is again an adjective describing 'Luft' (air), reflecting the clean and invigorating state of the air.
Nach dem Regen genießen wir die frische Luft im Park.
After the rain, we enjoy the fresh air in the park.
Here, 'auffrischen' derives from 'frischen' within a verb structure (to refresh), indicating the action of renewing or revitalizing knowledge.