We can rule out that option because it costs too much.
rule out
idiomTo reject an option from a list of possibilities.
The doctor ran several tests to rule out any serious health problems before starting the treatment.
Investigators had to rule out every other possible explanation before they could conclude that the fire was caused by a faulty electrical wire.
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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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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 the day
To set the standard which guides behavior; to control a situation, group, strategy, etc.