どくん

adverb, adverb taking the 'to' particle, noun

heavy heartbeat; thumping; pounding

Mimetic word describing a strong, sudden heartbeat, often from surprise, fear, or excitement. Can be used adverbially with と or as a noun.

• 心しん臓ぞうがどくんと鳴なった。

  My heart went thump.

• どくん、どくんと胸むねが高たか鳴なる。

  My chest pounds with a heavy thump-thump.