Chastise means to disciple or criticize severely.
Chastise is a verb.
Synonyms: beat, disciple, punish, spank, flog.
Antonyms: praise, reward.
It is more effective to teach a child through positive reinforcement than through chastisement.
Mr Ravi's mother chastised him for dying their dog's hair green.
My dad chastised me because I failed in the exam.