Jisho

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Adverb (fukushi), Adverb taking the 'to' particle
1. with a pitter-patter; choked up (with emotion); heart-wringing; momentary tightening of one's chest caused by powerful feelings (e.g. parting with a loved one)Onomatopoeic or mimetic word, esp. 胸がきゅん(と)なる
Other forms
キュン

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