To leave or escape (something). This lecture is so boring. Come on, let's blow the coop and go get a drink somewhere!I'm definitely blowing the coop when I turn 18—I can't wait to have a little freedom!
Typically said of an apartment building that has become a cooperative (or "co-op")—a building in which residents do not own property but rather own shares in the corporation that owns the building. I can't believe that our building is going co-op—I might need to move.
coop someone or something up
to confine someone or something in a small place. Don't coop me up. I can't stand small places.We had to coop up the dogs for a while.
Fig. to escape; to get out or get away. (Alludes to a chicken escaping from a chicken coop.) I couldn't stand the party, so I flew the coop.The prisoner flew the coop at the first opportunity.
Escape, run away, as in After years of fighting with my mother, my father finally flew the coop. This term originally meant "escape from jail," known as the coop in underworld slang since the late 1700s. [Late 1800s]