Meaning of “swing the balance” in the English Dictionary

british dictionary

"swing the balance" in British English

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swing the balance

If something swings the balance, it is the thing that causes a particular situation to happen or a particular decision to be made instead of other situations or decisions that are possible:

This latest election promise might just swing the balance in the candidate's favour.

(Definition of “swing the balance” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)