JMdict: 1419210

どんぐりの背比べ 【どんぐりのせいくらべ】

  1. [exp,n] having very little difference between one another; being much of a muchness; being more or less the same; height comparison among acorns
  2. [exp,n] pointless competition (between two equally unimpressive parties); pissing contest
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
背 Stature, Height, Back, Behind, Disobey, Defy, Go Back On, Rebel ハイ せ, せい, そむ.く, そむ.ける
比 Compare, Race, Ratio, Philippines ヒ くら.べる