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Jyutping caat3 zi1
Pinyin chá zhī

Definitions (Wiktionary)
  1. verb, literary
    to observe and understand
    (syn.) 考見, 考见
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    他把他的朋友藏了起来不让警察知道。
    他把他的朋友藏了起來不讓警察知道。
    tā bǎ tā de péng you cáng le qǐ lai bù ràng jǐng chá zhī dào 。
    • He hid his friend from the police.
Examples (粵典–words.hk)
  1. Cantonese
    佢将我哋嘅嘢报串俾警察知。
    佢將我哋嘅嘢報串俾警察知。
    keoi5 zoeng1 ngo5 dei6 ge3 je5 bou3 cyun3 bei2 ging2 caat3 zi1.
    • He ratted on us to the police.