他山の石以て玉を攻むべし
たざんのいしもってたまをおさむべし
tazan'noishimottetamawoosamubeshi
JMdict entry #2588420
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expressions (phrases, clauses, etc.)
proverb
one should learn from other's mistakes; stones from other mountains can be used to polish one's own gems
see: 他山の石