rule of thumb
idiomA general guideline, rather than a strict rule; an approximate measure or means of reckoning based on experience or common knowledge.
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as a rule
In general; most often.
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bright-line rule
A clear-cut rule, so that it is easy to make a decision.
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brown thumb
A lack of skill at growing plants; a poor gardening skill.
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butcher's thumb
A dishonest practice in which a butcher uses their thumb to add extra weight to a scale when weighing meat.
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fash one's thumb
To bother oneself; to worry about something.
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golden rule
A fundamental rule or principle.
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green thumb
A natural skill for gardening.
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ground rule
The basic rules or standards; basic principles.