ぱかっとMeanings1adverbwith one's mouth wide open; agapeonomatopoeic or mimetic word›Describes a mouth opening suddenly and widely, often from surprise or shock. Onomatopoeic.See also: ぽかんその光こう景けいに、彼かれはぱかっと口くちを開あけて驚おどろいた。He was so surprised at the sight that his mouth dropped open.
