This rule is my line in the sand.
line in the sand
idiomA defining moment; a cutoff point.
The manager drew a line in the sand and told the team that no more delays would be accepted.
By refusing to compromise on his core principles, he drew a firm line in the sand that defined the future of the negotiations.
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blur the line
To minimize or erode the distinction between two things.
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bottom line
The summary or result; the most important information.
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bottom of the line
The worst or lowest quality on the market, especially among a range of products.
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bright line
A clear distinction in the context of a legal, moral, ethical, or analytical judgment.
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build on sand
To put something in an unstable position by failing to give it a secure foundation.
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bury one's head in the sand
To deliberately ignore the reality of a situation; to pretend a problem does not exist.
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cross the line
To overstep a boundary, rule, or limit; to go too far or do something unacceptable.
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draw a line
To delimit a boundary or border.