noun
a person who is passionate about a particular cause, typically one that involves social or political change
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The politician was known for being a firebrand, always advocating for bold policy changes.
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My friend is a real firebrand when it comes to debating politics.
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That guy is a total firebrand - he never backs down from an argument.
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Her fiery personality and passionate speeches earned her the reputation of a firebrand in the industry.