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ブー

ブー, ブーッbuu

interjection

  1. beep
  2. honk (car horn)
  3. buzz (buzzer)
  4. boo (wrong answer, like buzzer on quiz shows)

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Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences