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Jyutping hoe1 seng1
Pinyin xū shēng

Definitions (Wiktionary)
  1. noun
    boo sound (as a sign of displeasure)
    • 噓聲四起
      嘘声四起
      xū shēng sì qǐ
      booing noises everywhere

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Jyutping heoi1 seng1
Pinyin xū shēng

Definitions (CC-CEDICT)
  1. hissing sound
  2. to hiss (as a sign of displeasure)
Examples (Wiktionary)
  1. Mandarin
    嘘声四起
    噓聲四起
    xū shēng sì qǐ
    • booing noises everywhere