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Jyutping sai3 baak3
Pinyin shì bó

Definitions (CC-CEDICT)
  1. uncle (affectionate name for a friend older than one's father)
  2. old friend
Definitions (粵典–words.hk)
  1. 名詞
    父母​嘅​男性​朋友​;​朋友​嘅​父​親​;​父執輩
    (honorific) father's friend; friend's father; uncle
Definitions (Wiktionary)
  1. noun
    male friend of one's father who is older than him
Definitions (Kaifangcidian)
  1. 伯伯
Examples (粵典–words.hk)
  1. Cantonese
    姻世伯
    姻世伯
    jan1 sai3 baak3
    • the father-in-law of your sibling
Examples (Wiktionary)
  1. Mandarin
    世伯
    世伯
    shì bó
    • uncle (friend of one's father)