Jisho

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Adverb (fukushi)
1. suddenly (hit); with a slapUsually written using kana alone, はったと is more emphatic
Adverb (fukushi)
2. sharply (glance, glare, etc.); fiercelyUsually written using kana alone
Adverb (fukushi)
3. suddenly; all of a sudden; in a flashUsually written using kana alone
Adverb (fukushi)
4. completely; totally; utterlyUsually written using kana alone
Other forms
礑と 【はったと】

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