つめのあかをせんじてのむ

爪の垢を煎じて飲む

表記・読み：つめの垢を煎じて飲む・爪のあかを煎じて飲む・つめのあかをせんじてのむ

1. 1

   to take a lesson from (someone serving as an example); to learn from someone's example; to boil the dirt under (someone's) fingernails and drink it

   expressions (phrases, clauses, etc.)五段動詞（む）idiomatic expression