From Longman Dictionary of Contemporary Englishtake a firm stand/linetake a firm stand/lineDETERMINEDto state your opinion clearly and not be persuaded to change it → firm
Examples from the Corpus
take a firm stand/line• But the Young King was incapable of taking a firm line.• Handing his keys to the parking valet, he decided that he would take a firm stand.• Stopping short of direction intervention, Carter had taken a firm line.• The decision to take a firm stand comes after local councillors revealed the misery suffered by many of their constituents.• Dauntless decided to take a firm stand in the matter. 