つめのあかをせんじてのむ
爪の垢を煎じて飲む
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
N3Expression
Expression, Godan verb (mu ending)
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