put flesh on something
put flesh on (the bones of) (something)
To add a lot of details to something in order to explain or illustrate it more completely. I just wish the writer had put flesh on the bones of the villain and her motivations—she seems to act against the protagonist for no apparent reason. I like your basic argument. Now just put flesh on the outline to give me a better sense of how you'll tackle the topic.
put flesh on somethingor
put flesh on the bones of something
If you put flesh on something or put flesh on the bones of something, you add more detailed information to it. It is hoped that the proposal will put some flesh on the concept. He will need to put flesh on the bones of his calls for greater community involvement.