Rough practical method of assessing or measuring sth, used based on past experience rather than on exact measurement, etc (and therefore not completely reliable in every case or in every detail)（对事物）粗略但实用的估计方法（通常凭经验而不作精确的计量等，故并非时时处处均可靠）。
例如：As a rule of thumb, you should cook a chicken for 20 minutes for each pound that it weighs.
凭经验估计，每磅鸡肉应烹调20分钟。
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