重箱の隅をほじくる
じゅうばこのすみをほじくる
juubakonosumiwohojikuru
JMdict entry #2207610
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expressions (phrases, clauses, etc.)Godan verb with 'ru' ending
idiomatic expression
to nitpick; to complain about trifles
see: 重箱の隅をつつく