tip the balance
● tip
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to give someone or something enough of an advantage to influence a result or decision
Her youth and competitiveness tipped the balance in her favour.
Thesaurus: to make something possiblesynonym
Main entry: tip
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Main Entry: ↑balance
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tip the ˈbalance/ˈscales idiom
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In an interview, smart presentation can tip the scales in your favour.
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New evidence tipped the balance against the prosecution.
Useful english dictionary. 2012.