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.
So what are some good rules of thumb for those trying to be supportive without inadvertently adding to the person's burdens? Yuki Noguchi, NPR, 30 June 2025 The rule of thumb for men’s tennis is, the longer the string of numbers on the scoreboard, the bigger the TV audience. Anthony Crupi, Sportico.com, 27 June 2025 As a rule of thumb, be sure to leave your pets, booze, drones and weapons at home, and don’t forget to bring lawn chairs and blankets. John Wenzel, Denver Post, 25 June 2025 The rule of thumb is always this: If an activity does not speed up or safeguard the goal anymore, cut it loose. Aaron Marcum, Forbes.com, 24 June 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 10 Jul. 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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