To make something flamboyant or extravagant in style; to dress up or present something in a showy manner.
Formed from 'flamboyant' with the '-ize' suffix (meaning to make or cause to become). A very rare formation that follows standard English verb-formation patterns.
'Flamboyantize' is theoretically possible in English but almost never actually used—it shows the difference between what language rules allow and what speakers actually choose to say.
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