To flatter excessively or insincerely; to behave as a flatterer does.
From gnathonic with the suffix -ize, which creates verbs meaning to act in the manner of something or to make something into a state; meaning to behave like a flatterer.
The -ize suffix is incredibly powerful in English—it can turn almost any word into a verb, so gnathonize literally means 'to act like Gnathonicus the ancient flatterer'!
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