Rule of thumb
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British pronunciation/ɹˈuːl ɒv θˈʌm/
American pronunciation/ɹˈuːl ʌv θˈʌm/

a method or principle solely based on experience, which may not be completely accurate

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rule of thumb definition and meaning

What is the origin of the idiom " rule of thumb" and when to use it?

The origin of the idiom "rule of the thumb" is not definitively known, but it is believed to have originated in the 17th century. It is believed to have derived from an old English law that permitted a man to beat his wife with a stick as long as it was no thicker than his thumb. This phrase has been in use since the 17th century, with one of the earliest recorded instances found in a book by Sir William Hope in 1692. It is used in various contexts and occasions where a practical, general guideline or estimate is needed.

The team will apply the rule of thumb to assess the feasibility of the new business venture.
The rule of thumb states that a 20-minute power nap can boost productivity.
The rule of thumb suggests that you should save at least 10% of your income.
Tomorrow, I will use the rule of thumb to estimate the cost of the renovation project.
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Meaning of "Rule of thumb"
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