rule of thumb

noun phrase

1
: a method of procedure based on experience and common sense
2
: a general principle regarded as roughly correct but not intended to be scientifically accurate

Examples of rule of thumb in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
How to Do a Self Breast Exam Weiss’s rule of thumb? Anisa Arsenault, Health, 24 Oct. 2025 To measure affordability, the rule of thumb is that a tenant should spend no more than 30% of their gross income on rent. Celia Fernandez, CNBC, 22 Oct. 2025 Even ten minutes of morning movement coupled with short breaks for stretching (as a rule of thumb, physical therapists recommend doing some stretches every 20 minutes) can help keep your limbs loose and your mind focused. Calin Van Paris, Outside, 14 Oct. 2025 Downing seven to 10 ounces every 10 to 20 minutes is a solid rule of thumb, according to both the American Council on Exercise and the National Athletic Trainers’ Association, as SELF has previously reported. Caroline Tien, SELF, 8 Oct. 2025 See All Example Sentences for rule of thumb

Word History

First Known Use

circa 1658, in the meaning defined at sense 1

Time Traveler
The first known use of rule of thumb was circa 1658

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Cite this Entry

“Rule of thumb.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rule%20of%20thumb. Accessed 29 Oct. 2025.

Kids Definition

rule of thumb

1
: a method based on experience and common sense
2
: a general principle that is roughly correct
Last Updated: - Updated example sentences
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