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Jyutping waa1 laa1 laa1
Pinyin huā lā lā

Definitions (CC-CEDICT)
  1. (onom.) crashing sound
Definitions (Wiktionary)
  1. intj, onomatopoeic
    Used for the pitter-patter of rain or numerous objects falling down and scattering on the ground.
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)