To carefully consider the pros and cons of something before making a decision.
This British phrase uses the metaphor of weighing on scales, where different factors are balanced against each other. It emerged in the 19th century, reflecting the commercial importance of accurate weighing in trade and the transfer of this precision to decision-making.
The scales metaphor is beautifully precise - it suggests that good decisions require not just listing pros and cons, but actually measuring their relative importance. It's the difference between counting arguments and weighing their true significance.
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