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Jyutping aa3 jat1
Pinyin ā yī

Definitions (CC-CANTO)
  1. the top boss [colloquial]
Definitions (粵典–words.hk)
  1. 名詞、俚語
    一個​組織​入面​地位​最高​嘅​一​個​人
    (literally: Mr One) the top boss, the top leader, the "Mr Big"
  2. 名詞、俚語
    專指​監獄​長
    the head of prisons, the director of correctional services
  3. 名詞、俚語
    專指​警務署​署長
    the chief of police
  4. 近義詞
    一哥