As a verb:
* The sunflowers flourished in the warm summer sun. (meaning: to grow and thrive)
* The artist's career flourished after her first solo exhibition. (meaning: to prosper and become successful)
* The dancer flourished her arms in a graceful gesture. (meaning: to move with elegance and energy)
As a noun:
* The calligrapher's work is characterized by its elaborate flourishes. (meaning: a decorative element or embellishment)
* The musician added a flourish to the end of the song. (meaning: a showy or impressive display)
* The company's success was a flourish of good fortune. (meaning: a display of good fortune or success)
Let me know if you'd like more examples!