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rule of thumb
- ▪ a broadly accurate guide or principle, based on practice rather than theory
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Rule of thumb
Principle with broad application that is not intended to be strictly accurate or reliable for every situation
In English, the phrase rule of thumb refers to an approximate method for doing something, based on practical experience rather than theory. This usage of the phrase can be traced back to the 17th century and has been associated with various trades where quantities were measured by comparison to the width or length of a thumb. Wikipedia
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