To raise to the rank of baron or to give baronial status to someone or something.
From baron plus the verb-forming suffix -ize (from Greek -izein). The -ize suffix creates verbs meaning 'to make' or 'to cause to be' the thing described by the root.
The -ize suffix is so powerful in English that you can take almost any noun and 'verbify' it—baronize, monetize, weaponize—it's English's favorite way of creating new verbs on demand.
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