The company has a bright-line rule against using phones during meetings.
bright-line rule
idiomA clear-cut rule, so that it is easy to make a decision.
To avoid confusion, the manager established a bright-line rule that all project reports must be submitted by Friday at noon.
The court established a bright-line rule to ensure that future judges could apply the law consistently without needing to interpret vague circumstances.
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as a rule
In general; most often.
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golden rule
A fundamental rule or principle.
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ground rule
The basic rules or standards; basic principles.
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rule in
To consider (something) as a possible option among others.
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rule of thumb
A general guideline, rather than a strict rule; an approximate measure or means of reckoning based on experience or common knowledge.
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rule OK
To be popularly accepted, or supported by the general majority of people.
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rule out
To reject an option from a list of possibilities.
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rule the day
To set the standard which guides behavior; to control a situation, group, strategy, etc.