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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.

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

From Salon • May 24, 2026

As a rule of thumb, every $10 rise in oil adds about five cents per pound to polyethylene, according to Morales.

From Barron's • May 12, 2026

A space rule of thumb holds that costs drop 90% when robots replace people.

From The Wall Street Journal • Apr. 24, 2026

As a rule of thumb, parents should only invest for college after getting their retirement savings on track.

From MarketWatch • Apr. 1, 2026

“The rule of thumb is that you buy at ten and sell at twenty.”

From "The Big Short" by Michael Lewis




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