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Jyutping aa2 hau2 mou4 jin4
Pinyin yǎ kǒu wú yán

Definitions (CC-CEDICT)
  1. dumbstruck and unable to reply (idiom)
  2. left speechless; at a loss for words
Definitions (粵典–words.hk)
  1. 動詞
    俾人​質問​或者​駁​斥​嗰​陣​,​唔​出聲​、​冇​嘢​好講
    to be unable to say anything; to have no further arguments to justify oneself
    • 佢準備不足,俾人問到啞口無言。
      佢准备不足,俾人问到哑口无言。
      keoi5 zeon2 bei6 bat1 zuk1, bei2 jan4 man6 dou3 aa2 hau2 mou4 jin4.
      He was not well-prepared, and he couldn't say anything to respond.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be speechless in response to being interrogated or refuted
    (syn.) 默不作声, 默不作聲
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    她注视着一个不明飞行物,哑口无言。
    她注視着一個不明飛行物,啞口無言。
    tā zhù shì zhe yí gè bù míng fēi xíng wù , yǎ kǒu wú yán 。
    • She stared at a UFO in silence.
Examples (粵典–words.hk)
  1. Cantonese
    佢准备不足,俾人问到哑口无言。
    佢準備不足,俾人問到啞口無言。
    keoi5 zeon2 bei6 bat1 zuk1, bei2 jan4 man6 dou3 aa2 hau2 mou4 jin4.
    • He was not well-prepared, and he couldn't say anything to respond.
Examples (Wiktionary)
  1. Mandarin
    哑口无言
    啞口無言
    yǎ kǒu wú yán
    • to be left speechless