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Jyutping sei3 hoi2 jat1 gaa1
Pinyin sì hǎi yī jiā

Definitions (CC-CANTO)
  1. home everywhere, it means the world is united
Definitions (Wiktionary)
  1. phrase, idiomatic
    the world is a big family
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    他们的目标和活动的主要思想是真正的四海一家和各民族的普遍公正。
    他們的目標和活動的主要思想是真正的四海一家和各民族的普遍公正。
    tā men de mù biāo hé huó dòng de zhǔ yào sī xiǎng shì zhēn zhèng de sì hǎi yī jiā hé gè mín zú de pǔ biàn gōng zhèng 。
    • Their goal and activating main idea was indeed brotherhood and justice among the peoples.