put flesh on the bones (of something)

idiomPart offlesh

put flesh on the bones (of something) — idiom

1. to add necessary details or substance to a basic idea, plan, or argument, making

1.idiom
Definition

to add necessary details or substance to a basic idea, plan, or argument, making it more complete.

Example

The committee had a rough plan, and the project manager was asked to put flesh on its bones.