chastener

/ˈtʃeɪsənər/
noun
  1. A person or thing that punishes or criticizes someone in order to improve their behavior.
    • The coach acted as a chastener, pushing the athletes to work harder.
    • The strict principal was known as a chastener of lazy students.
    • Life itself can be a harsh chastener, teaching lessons through failure.
Antonyms
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