呉下の阿蒙に非ず、呉下の阿蒙にあらず
ごかのあもうにあらず
gokanoamouniarazu
JMdict entry #2870392
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expressions (phrases, clauses, etc.)
to no longer be the same old person; to have made remarkable progress; to have improved significantly (through study)
see: 呉下の阿蒙