A general rule based on experience.
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A rough guide based on experience rather than strict rules.
A rule of thumb gives you a useful starting point.
It won't always be exact, but it works well enough most of the time.
"Best Practice"
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A proven, recommended method — more formal and authoritative than a rule of thumb
"Golden Rule"
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A fundamental moral principle — rules of thumb are about practical guidance, not ethics
"Rule of Thumb"
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A practical general guideline based on experience that works in most situations