Jisho

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Adverb (fukushi), Suru verb
1. flaring up; burning hotly; suddenly becoming brightOnomatopoeic or mimetic word
  • そと
  • 出る
  • つよ強い
  • ひざ日差し
  • カッと
  • 照らされた
I stepped outside and was bathed in the harsh, direct sunlight.
Adverb (fukushi), Suru verb
2. flying into a rage; losing one's coolOnomatopoeic or mimetic word
  • かれ
  • カッと
  • して
  • あに
  • なぐった
He hit his brother in a rage.
Adverb (fukushi), Suru verb
3. opening suddenly and widely (e.g. eyes, mouth)Onomatopoeic or mimetic word
Adverb (fukushi), Suru verb
4. acting resolutelyOnomatopoeic or mimetic word, Archaic
Other forms
かっと

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