Tsubazeriai means warding off (and pushing back) each other's sword with one's own sword guard in a duel, this is also synonymous with "neck-and-neck" competition.
鍔迫り合い（つばぜりあい）とは、互いに相手の打った刀を自分の刀の鍔で受け止め、押し合うこと、転じて激しい試合のこともさす。