burgeon UK /ˈbɜː.d͡ʒən/US /ˈbɝː.d͡ʒən/verb 3noun 1forms 6 verb3 •To grow or expand.Gradually, the town burgeoned into a thriving city. •To swell to the point of bursting. •(no longer used) Of plants, to bloom, bud. noun1 •(no longer used) A bud, sprout, or shoot. formsburgeoned · bourgeoning · burgeoning · burgeoneth · burgeons · burgeonest