Jisho

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Adverb (fukushi), Adverb taking the 'to' particle
1. acutely (feel); keenly; severelyUsually written using kana alone
Adverb (fukushi), Adverb taking the 'to' particle
2. tightly; hardUsually written using kana alone
Other forms
犇々 【ひしひし】緊緊 【ひしひし】緊々 【ひしひし】ヒシヒシ
Notes
犇犇: Rarely-used kanji form. 犇々: Rarely-used kanji form. 緊緊: Rarely-used kanji form. 緊々: Rarely-used kanji form.

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