The palm branch has traditionally been used as a symbol of victory. It is no wonder then that the word palm came to mean "victory" or "triumph" in the late 14th century, thanks to the likes of Geoffrey Chaucer. Centuries later, William Shakespeare would employ palmy as a synonym for triumphant or flourishing in the tragedy Hamlet when the character Horatio speaks of the "palmy state of Rome / A little ere the mightiest Julius fell."
they knew her in her palmy days when she was living high a palmy suburb with lots of new homes and shopping malls
Recent Examples on the WebRemember those palmy days when conservative conspiracy theorists outside elective politics spread the word that Democrats wanted to molest your children? Timothy Noah, The New Republic, 13 May 2022