fly the coop

verb2

1. •
   To escape from a pen or similar enclosure.

   • Explained a Curtiz assistant: "We had three ravens in Assisi; one died of cold, and another flew the coop." — 1961
2. •
   (figurative) To depart hastily or unannounced; to escape or flee.

   • Not liking the accommodations, I took the first chance and flew the coop. — 1910