To make or become fleshy; to add flesh or body to something.
From 'flesh' with the suffix '-en,' a productive Old English suffix that forms verbs meaning 'to make' or 'to become.' This follows the same pattern as 'darken,' 'lighten,' and 'strengthen.'
This is a wonderfully rare verb that shows how English lets us turn almost any noun into a verb—if you can 'darken' something, why not 'fleshen' it?
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