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Related to flesh out: flush out
To develop something more fully. A noun or pronoun can be used between "flesh" and "out." I can't judge your story in its current state—you need to flesh it out more and then resubmit it.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
flesh something out (with something)
Fig. to make something more detailed, bigger, or fuller. This is basically a good outline. Now you'll have to flesh it out. The play was good, except that the author needed to flesh out the third act. It was too short.
to become more fleshy. She began to flesh out at the age of thirteen. After his illness, Tom fleshed out and regained his strength.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Also, put flesh on the bones of. Give substance to, provide with details, amplify. For example, The editor told her to flesh out the story, or You need to put flesh on the bones of these characters. This metaphoric expression, alluding to clothing a nude body or adding flesh to a skeleton, was in the mid-1600s put simply as to flesh, the adverb out being added about two centuries later.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
To fill in, enrich, or build on the content or structure of something: At the meeting, we fleshed out the plans for our trip. This paragraph is not specific enough—you should flesh it out.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.