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Jyutping hoi2 fut3 tin1 hung1
Pinyin hǎi kuò tiān kōng

Definitions (CC-CEDICT)
  1. wide sea and sky (idiom); boundless open vistas
  2. the whole wide world
  3. chatting about everything under the sun
Definitions (粵典–words.hk)
  1. 語句
    形容​天地​遼闊​而​了​無邊際
    as boundless as the sea and the sky; literally: sea wide sky empty
  2. 語句
    比喻​一個​人​睇​嘢​睇​得​好​開​,​因而​心情​開朗
    to describe a state of contentment by letting things go
Definitions (Wiktionary)
  1. phrase, idiomatic, of imagination or a conversation
    without restriction or limit; discursive
  2. phrase, idiomatic
    bold and unconstrained
  3. phrase, idiomatic
    the sea and the sky is expansive and boundless; as boundless as the sea and sky
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    忍一时,风平浪静. 让一步, 海阔天空.
    忍一時,風平浪靜. 讓一步, 海闊天空.
    rěn yī shí , fēng píng làng jìng . ràng yī bù , hǎi kuò tiān kōng .
    • If you are patient in one moment of anger, you will escape a hundred days of sorrow.
Examples (粵典–words.hk)
  1. 今天我!寒夜里看雪飘过。(出自 Beyond《海阔天空》)
    今天我!寒夜裏看雪飄過。(出自 Beyond《海闊天空》)
    • Today, I watch snow fell at a freezing night.