Vocabulary What does かっと mean? かっと means flaring up in a sudden rage; or a blaze of heat (fire, a flushed face). Quick factsReadingかっと かっとかっとTOPICSflaring up in a sudden rage; or a blaze of heat (fire, a flushed face)Example sentences彼(かれ)はすぐかっとなるので、話(はな)し合(あ)いが進(すす)まない。He loses his temper so quickly that the discussion makes no progress.