the.com/flourish

means To grow or develop vigorously and successfully — and, by extension, to wave something about with a showy, confident gesture.

from Traces back through Old French 'florir' (to flower, blossom) to Latin 'florere,' itself rooted in 'flos' — flower. The connection to showy hand gestures and ornamental flair in writing or music came later: a flourish of the pen mimics the way a plant bursts into bloom, so the word kept its roots even as it wandered from gardens into ballrooms and signatures.