両雄並び立たず

りょうゆうならびたたず

expression

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if two ride upon a horse, one must sit behind, when Greek meets Greek, then comes the tug of war, two great rivals cannot coexist(proverb)

両	both, old Japanese coin, counter for carriages (e.g., in a train), two
雄	masculine, male, hero, leader, superiority, excellence
並	row, and, besides, as well as, line up, rank with, rival, equal
立	stand up, rise, set up, erect