Jisho

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Adverb taking the 'to' particle
1. vacantly; blankly; absentmindedlyOnomatopoeic or mimetic word
Adverb taking the 'to' particle
2. openmouthed; with one's mouth wide-open; gaping; flabbergastedOnomatopoeic or mimetic word
Adverb taking the 'to' particle
3. with a whack; with a thumpOnomatopoeic or mimetic word
Other forms
ポカンぱかんパカン

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