Definition
To swing the balance means to be the decisive factor that influences an outcome or decision among multiple possibilities.
拔足先登
At the last minute, the emergence of new evidence swung the balance in favor of the defendant.
在最后一刻，新证据的出现使局势转向有利于被告。
Despite the teams being evenly matched, the star player's arrival ultimately swung the balance, securing their victory in the championship.
尽管两队实力相当，但明星球员的到来最终决定了胜负，确保了他们在冠军赛中的胜利。
Both candidates were popular, but one’s excellent performance in the debate swung the balance for the voters.
两位候选人都很受欢迎，但其中一位在辩论中的出色表现为选民做出了决定。