flush out

verb2

1. •
   To drive out or expose something or someone, as a game bird or other game animal from cover.

   • The dogs flushed out some doves.
   • The army flushed out the enemy spy.
2. •
   (nonstandard) To flesh out.

   • Brainstorming with friends and colleagues can help you flush out the details of the idea. — 2009