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Jyutping aa3 suk1
Pinyin ā shú

Definitions (Wiktionary)
  1. noun, dated, dialectal, euphemistic
    dad
  2. noun, dialectal
    brother-in-law (husband's younger brother)
  3. noun, dialectal
    paternal uncle (father's younger brother)
  4. noun, Cantonese, informal
    middle-aged man (Classifier: 個/个 c)

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Jyutping aa3 suk1
Pinyin ā shū

Definitions (CC-CANTO)
  1. uncle (spoken)
Definitions (粵典–words.hk)
  1. 名詞
    阿爸​嘅​細​佬
    uncle; father's younger brother
    • 我阿叔個樣好似我阿爸。
      我阿叔个样好似我阿爸。
      ngo5 aa3 suk1 go3 joeng2 hou2 ci5 ngo5 aa3 baa4.
      My uncle looks like my dad.
  2. 名詞
    非正式​、​比較​輕​鬆​嘅​場​合​中​,​對​中年男人​嘅​稱​謂​(​量​詞​:​個​)
    casual form of address to a middle-aged man
    • 間茶餐廳好多阿叔打躉。
      间茶餐厅好多阿叔打趸。
      gaan1 caa4 caan1 teng1 hou2 do1 aa3 suk1 daa2 dan2.
      There are many middle-aged men hanging around at the cha chaan teng.
  3. 名詞
    用​嚟​做​男性​用​嘅​第一​身​代名​詞​,​以向​外人​顯示​自己​嘅​長​輩​身份​(​量​詞​:​個​)
    a personal pronoun used by a male to bring his seniority to the attention of non-family members
    • 阿叔食鹽多過你食米 呀。
      阿叔食盐多过你食米 呀。
      aa3 suk1 sik6 jim4 do1 gwo3 nei5 sik6 mai5 aa3.
      Your uncle(=me) has eaten more salt than you have eaten rice. (= I am way more experienced than you are.)
  4. 近義詞
    叔叔、叔父
Definitions (Wiktionary)
  1. noun, dialectal
    brother-in-law (husband's younger brother)
  2. noun, dialectal
    paternal uncle (father's younger brother)
  3. noun, dated, dialectal, euphemistic
    dad
  4. noun, Cantonese, informal
    middle-aged man (Classifier: 個/个 c)
Examples (Tatoeba—Cantonese-English)
  1. Cantonese
    我阿叔住喺西班牙嘅首都马德里。
    我阿叔住喺西班牙嘅首都馬德里。
    ngo5 aa3 suk1 zyu6 hai2 sai1 baan1 ngaa4 ge3 sau2 dou1 maa5 dak1 lei5 。
    • My uncle lives in Madrid, the capital of Spain.
Examples (粵典–words.hk)
  1. Cantonese
    呢个系我阿叔。
    呢個係我阿叔。
    ni1 go3 hai6 ngo5 aa3 suk1.
    • 這個是我的叔父。
    • He is my uncle.
  2. Cantonese
    佢揸车撞低个阿叔之后,望都无望就扬长而去。
    佢揸車撞低個阿叔之後,望都無望就揚長而去。
    • He drove away callously after hitting a middle-aged man with his car.
  3. Cantonese
    我阿叔个样好似我阿爸。
    我阿叔個樣好似我阿爸。
    ngo5 aa3 suk1 go3 joeng2 hou2 ci5 ngo5 aa3 baa4.
    • My uncle looks like my dad.
  4. Cantonese
    间茶餐厅好多阿叔打趸。
    間茶餐廳好多阿叔打躉。
    gaan1 caa4 caan1 teng1 hou2 do1 aa3 suk1 daa2 dan2.
    • There are many middle-aged men hanging around at the cha chaan teng.
  5. Cantonese
    阿叔食盐多过你食米 呀。
    阿叔食鹽多過你食米 呀。
    aa3 suk1 sik6 jim4 do1 gwo3 nei5 sik6 mai5 aa3.
    • Your uncle(=me) has eaten more salt than you have eaten rice. (= I am way more experienced than you are.)