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Jyutping jiu5 hau2
Pinyin rào kǒu

Definitions (Wiktionary)
  1. adj
    hard to pronounce; tongue-twisting

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Jyutping kiu5 hau2
Pinyin rào kǒu

Definitions (粵典–words.hk)
  1. 形容詞
    形容​一​啲​詞語​好​難​發音​或者​好難​講得​順口
    hard to pronounce; difficult to say
    • 呢個急口令好繑口。
      呢个急口令好繑口。
      ni1 go3 gap1 hau2 ling6 hou2 kiu5 hau2.
      This tongue twister is really hard.
  2. 近義詞
    拗口
  3. 參看
    蹺口、繑口
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    你最喜欢哪一个绕口令?
    你最喜歡哪一個繞口令?
    nǐ zuì xǐ huan nǎ yī ge rào kǒu lìng ?
    • What's your favorite tongue twister?