ぎゃふん

adverb taking the 'to' particle

speechless; argued into silence

Describes the state of being completely silenced by a counterargument, often used with と and verbs like 言う or なる. Conveys a sudden, helpless loss for words.

• 彼かれの鋭するどい指し摘てきに、相あい手てはぎゃふんと言いった。

  At his sharp point, the opponent was left speechless.

• あれだけ威い張ばっていたのに、証しょう拠こを見みせられてぎゃふんとなった。

  He had been so arrogant, but when shown the evidence, he was completely silenced.