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どんぐりの背比せいくらべ

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どんぐりのせいくらべ
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Meaning
    1. ①
      having very little difference between one another; being much of a muchness; being more or less the same; height comparison among acorns
      こういう流ながれになると結局けっきょく、どんぐりの背比せいくらべになる。
      Once things start going this way, in the end they'll all be much of a muchness.
    2. ②
      pointless competition (between two equally unimpressive parties); pissing contest
Kanji
背 ハイ stature, height, back 比 ヒ compare, race, ratio
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