English version

be a matter of principle

From Longman Dictionary of Contemporary Englishbe a matter of principlebe a matter of principleto be something that you feel you must or must not do, because of your moral principles She couldn’t take the money. It was a matter of principle. matter
Examples from the Corpus
be a matter of principleDessert is a matter of principle here.It was a matter of principle.First, there are matters of principle.They might have gone higher but this is a matter of principle.It seemed, as much as anything, to be a matter of principle.
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