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Jyutping co1 sang1 zi1 duk6
Pinyin chū shēng zhī dú

Definitions (Wiktionary)
  1. phrase, idiomatic, literally
    newborn calf
  2. phrase, figuratively, idiomatic
    simple or daring young person
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    初生之犊不畏虎。
    初生之犢不畏虎。
    chū shēng zhī dú bù wèi hǔ 。
    • Fools rush in where angels fear to tread.
    • The sacrificed newborn doesn't fear the tiger.