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Definition of Rule of thumb
1. Noun. A rule or principle that provides guidance to appropriate behavior.
Definition of Rule of thumb
1. Noun. A general guideline, rather than a strict rule; an approximate measure or means of reckoning based on experience or common knowledge. ¹
2. Noun. (attributive usually hyphenated) Approximated, guesstimated. ¹
¹ Source: wiktionary.com