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Jyutping hap6 hap6 baa1 baa1
Pinyin kē ke bā bā

Definitions (Wiktionary)
  1. phrase, idiomatic
    to stutter; to stammer

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Jyutping hap6 hap6 baa1 baa1
Pinyin kē kē bā bā

Definitions (CC-CEDICT)
  1. stammering
  2. stuttering
  3. not speaking fluently