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にけちをつける

find fault with

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phrase Rare #39,170
find fault with Used when criticizing or nitpicking someone or something, often unnecessarily.
JA: 人の仕事にけちをつけるのは良くないぞ？
EN: You shouldn’t find fault with other people’s work.

人の仕事にけちをつけるのは良くないぞ？

It’s not nice to criticize other people’s work, you know?

どうしてジェイムズがいつも奥さんにけちをつけるのか、僕には理解できない。

I can't understand why James is always criticizing his wife.

他人のやることにけちをつけるのは簡単である。

It's easy to find fault with what other people do.