Expressions (phrases, clauses, etc.), Godan verb with '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
Idiomatic expression
Also written つめの垢を煎じて飲む【つめのあかをせんじてのむ】、爪のあかを煎じて飲む【つめのあかをせんじてのむ】