flesh (something) out or flesh out (something)
to make something more detailed or bigger
We worked hard during the weekend to flesh out our agreement.
Movies for Valentines Day
The Princess Bride
Buttercup thinks that she will never see her beloved Westley again after his ship is captured by the Dread Pirate Roberts. When Westley returns, the couple must conquer an evil prince, a dangerous Fire Swamp and even death before they can finally be reunited.