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Jyutping haai4 zi2 wong2
Pinyin hái zi wáng

Definitions (Wiktionary)
  1. noun
    grown-up popular with children or leader of a group of children
  2. noun, humorous
    teacher at a primary school or kindergarten
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    幼儿园老师有时被称为孩子王。
    幼兒園老師有時被稱為孩子王。
    yòu ér yuán lǎo shī yǒu shí bèi chēng wéi hái zi wáng 。
    • Teachers in kindergarten are sometimes referred to as leaders of children.