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Definitions

rule of thumb

NOUN
informal guiding principle
Synonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

But that’s a rule of thumb, not gospel.

From MarketWatch • Jun. 2, 2026

My rule of thumb is to add one cup of cottage cheese for every cup of sauce.

From Salon • May 24, 2026

“The rule of thumb I use with clients is six months liquid, minimum, and that number goes up if you’re carrying financial responsibility for adult children or aging parents.”

From MarketWatch • May 14, 2026

A common rule of thumb for builder investors is buy the stocks when they trade at one-times book value and sell at two-times book value.

From Barron's • Apr. 12, 2026

“Over the years military planners have arrived at a rule of thumb which dictates that functional fighting units cannot be substantially larger than 200 men,” Dunbar writes.

From "The Tipping Point" by Malcolm Gladwell




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