To design or represent in the manner of heraldry, or to proclaim like a herald.
From 'herald' with the suffix '-ize' (from Greek '-izein'), which creates verbs meaning to make, become, or act like the root word; this is a productive suffix in English.
To 'heraldize' something means to turn it into a formal symbol or announcement—it's like taking something and giving it the official herald treatment with all the ceremony that implies.
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