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Discover Ludwig"ironclad rule" is a correct and usable term in written English.
It is typically used to describe a rule that is inflexible, unchangeable, and concrete. For example: "The ironclad rule of the school's attendance policy is that students must attend all classes to receive credit."
Exact(42)
It's an ironclad rule.
This isn't an ironclad rule.
He has an ironclad rule that the customer comes first.
But Purcell does not lay down an ironclad rule against last-minute changes.
One ironclad rule, of course: "Try not to burn yourself," Mr. Arnold said.
He made just one ironclad rule, one that his charges did not seem to mind.
Similar(18)
There were only two ironclad rules in the brawl.
A: Although it happens a lot for sports events, there are no ironclad rules.
What looks like anarchic activity in Lagos is actually governed by a set of informal but ironclad rules.
And it may get pushback from city agencies that have ironclad rules about how transport services must operate.
Among the ironclad rules for applications: Make sure the buyer really knows the people listed as references.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com