to chasten (purify spiritually through austerity, asceticism, and/or bodily pain)
From Middle Low German and northern Middle High German kastīen, kastīgen, variant of kestigen, from Old High German kestigōn (“to castigate”), from Proto-West Germanic *kastīgōn. The northern form was spread by Luther.
Practice speaking and memorizing "kasteien" and many other words and sentences in German.