tip the scales
左右某种情况或决定的结果，通常是通过施加影响或增加权重来实现
书面/口语·描述决定性影响
英文释义
to influence a situation in a particular way, especially in favor of one side or outcome
例句
Her vote tipped the scales in favor of the new policy.
典故来源
源自天平称重，通过增加砝码使天平倾斜，比喻施加影响改变结果。