ぱくっと

adverb

gaping widely; with a wide-open mouth

Mimetic adverb describing a mouth opening wide, often in surprise or to take a big bite. Used with verbs like 開ける or 食べる.

• 大おおきな口くちをぱくっと開あけて、おにぎりをほおばった。

  He opened his mouth wide and stuffed in the rice ball.

• その光こう景けいに驚おどろいて、ぱくっと口くちが開ひらいたままになった。

  Astonished by the sight, my mouth hung open.