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Jyutping gaam1 juk6 zoeng2
Pinyin jiān yù zhǎng

Definitions (Wiktionary)
  1. noun
    jail warden
    (syn.) 班头爷, 班頭爺
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    暴动开始时只有一位监狱长值班。
    暴動開始時只有一位監獄長值班。
    bào dòng kāi shǐ shí zhǐ yǒu yī wèi jiān yù zhǎng zhí bān 。
    • There was only one warden on duty when the riot started.