/ ˈbɜːdʒən; NAmE ˈbɜːrdʒən/ verb
[ v ] ( formal ) to begin to grow or develop rapidly
► bur·geon·ing adjective :
a burgeoning population
burgeoning demand
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WORD ORIGIN
Middle English : from Old French bourgeonner put out buds, from borjon bud, based on late Latin burra wool.