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A rule of thumb

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Not Precise

The phrase implies a general approach and is not meant for situations requiring accuracy or scientific measures.

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A rule of thumb for cooking pasta is to use one liter of water per 100g of pasta, but adjust as needed.
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Experience-Based

The guideline mentioned is often derived from someone's experience rather than official rules.

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A rule of thumb in business is to always follow up with clients within 24 hours.
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Common Usage

It's widely used in everyday English conversations and is familiar to most native speakers.

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As a rule of thumb, fill your car's gas tank when it reaches a quarter full.
Visual representation of the word "A rule of thumb"

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