To place a crown or coronet on someone; to crown or invest with a crown.
From corona (crown) plus the verb-forming suffix -ize (from Greek -izein), meaning 'to make' or 'to do,' so 'to crown someone.'
The -ize suffix is one of English's superpowers—it can turn almost any noun into a verb (hospital → hospitalize, legal → legalize), which is why coronize makes perfect sense!
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