あいた口が塞がらぬ、開いた口が塞がらぬ
あいたくちがふさがらぬ
aitakuchigafusagaranu
JMdict entry #2038940
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expressions (phrases, clauses, etc.)noun or verb acting prenominally
surprising; shocking; jaw-dropping
see: 開いた口も塞がらぬ