ChatterBank1 min ago
Rule of thumb
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What is the origin of the expression, a rule of thumb?
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If you click here, that will link you to a web-page which explains.
E. Cobham Brewer 1810�1897. Dictionary of Phrase and Fable. 1898.
Rule of Thumb (The).
A rough guess-work measure. Measuring lengths by the thumb. In some places the heat required in brewing is determined by dipping the thumb into the vat
Found this through Google. Sounds unlikely enough to be true!
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