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Jyutping jap1 bat1 sing4 sing1
Pinyin qì bù chéng shēng

Definitions (CC-CANTO)
  1. to break down in tears; to sob
Definitions (粵典–words.hk)
  1. 語句
    喊​得​太​犀利​,​講​嘢​都講​唔​到
    to choke with sobs
    • 佢交通意外之後仍然好鎮定,不過一見到媽媽就即刻泣不成聲。
      佢交通意外之后仍然好镇定,不过一见到妈妈就即刻泣不成声。
      He was calm after the accident. But when he saw mum he was choked with sobs.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to choke with sobs; to cry so much that one cannot utter a word
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    听到这个悲伤的消息,她泣不成声。
    聽到這個悲傷的消息,她泣不成聲。
    tīng dào zhè ge bēi shāng de xiāo xi , tā qì bù chéng shēng 。
    • Hearing the sad news, she collapsed in tears.
  2. Mandarin
    他刚进房间,她就泣不成声了。
    他剛進房間,她就泣不成聲了。
    tā gāng jìn fáng jiān , tā jiù qì bù chéng shēng le 。
    • Hardly had he entered the room, when she burst into tears.
Examples (粵典–words.hk)
  1. Cantonese
    泣不成声
    泣不成聲
    jap1 bat1 sing4 sing1
    • to choke with sobs
  2. Cantonese
    佢交通意外之后仍然好镇定,不过一见到妈妈就即刻泣不成声。
    佢交通意外之後仍然好鎮定,不過一見到媽媽就即刻泣不成聲。
    • He was calm after the accident. But when he saw mum he was choked with sobs.