To make purple.

To enrage or anger, referring to making the face purple or red with blood.

Of writing, to make overly flowery or showy; to embellish unduly.

Made purple, especially having a purple complexion because of rage etc.

“2004. "Intended as ironic, this remark empurpled the anti-anti-Communists who predominated on the intellectual left." —Christopher Hitchens. "Susan Sontag: Remembering an intellectual heroine." http//www.slate.com/id/2111506”

(of a text) over-embellished or flowery