This is the 754th most frequent Dutch word.
keren
"Turn" or "reverse."
In this sentence, "keert" refers to the act of returning to a previous place or origin.
Hij keert elke zomer terug naar zijn geboortedorp.
Every summer, he returns to his hometown.
Here, "keer" is used as a noun meaning 'time' or 'instance', indicating the frequency of an action or event.
Na drie keer proberen had hij eindelijk succes.
After three attempts, he finally succeeded.
The verb "keer" here means 'to turn' or 'to flip' in the physical sense, often used to describe the act of turning something over.