Mona Lisa

noun2

1. •
   (figurative) A masterpiece, an outstanding work.

   • I told him I didn't care if the painting was a Mona Lisa or pure nonsense, I just wanted him to have the experience of painting on canvas. — 2007
2. •
   (figurative) A woman who resembles the subject of this painting, renowned for her beauty and enigmatic smile.

   • She let him take it and sat on, smiling very faintly. It was a Mona Lisa effort. — 1972