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Jyutping gwan3 paang5 zi1 haa6 ceot1 haau3 zi2
Pinyin gùn bàng zhī xià chū xiào zǐ

Definitions (Wiktionary)
  1. proverb
    spare the rod and spoil the child
    (syn.) 棍棒底下出孝子, 棒下出孝子