This is the 12327th most frequent Russian word.
каждые
"Каждые" means "every."
Here, 'каждые' is used to mean 'every' and modifies the plural noun 'выходные' (weekends), indicating a recurring action related to each instance of weekends.
Каждые выходные мы ходим в парк.
Every weekend we go to the park.
In this sentence, 'каждые' refers to the recurring time span 'три дня' (three days), indicating that something happens regularly within that period.
Он покупает новые цветы каждые три дня.
He buys new flowers every three days.
Here, 'каждые' modifies the plural noun 'каникулы' (vacations), again illustrating its function to signify occurrence during each instance of the mentioned period.