カッと

adverb, noun or participle which takes 'suru'

flaring up; burning hotly; suddenly bright

Describes something suddenly becoming bright, hot, or intense, like a flame flaring up or the sun blazing.

• ストーブがカッと燃もえ上あがった。

  The stove flared up with a sudden blaze.

• 真ま夏なつの太たい陽ようがカッと照てりつける。

  The midsummer sun beats down intensely.

adverb, noun or participle which takes 'suru'

flying into a rage; losing one's cool

Used for a sudden, explosive burst of anger; often with なる or する.

• 彼かれはその言こと葉ばにカッとなって怒ど鳴なった。

  He flew into a rage at those words and yelled.

adverb, noun or participle which takes 'suru'

opening suddenly and widely (eyes, mouth)

Describes eyes or mouth opening wide in surprise, shock, or intensity; often with 見開く or 開く.

• 驚おどろいて目めをカッと見み開ひらいた。

  I opened my eyes wide in surprise.

adverb, noun or participle which takes 'suru'

acting resolutely

Archaic use for acting with sudden determination or firmness; rarely encountered in modern Japanese.

• 古ふるい文ぶん献けんでは「カッと決けつ断だんする」のように使つかわれることがある。

  In old texts, it is sometimes used like 'to decide resolutely'.