rule of thumb

The definition of a rule of thumb is a generally accepted guideline, policy or method of doing something based on practice rather than facts.

(noun)

An example of a rule of thumb is the general guideline that you don't wear white after Labor Day.

See rule of thumb in Webster's New World College Dictionary

Origin: from the method of measuring by the thumb

See rule of thumb in American Heritage Dictionary 4

noun pl. rules of thumb

A useful principle having wide application but not intended to be strictly accurate or reliable in every situation.

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