also: ていをなす
expression, godan verb (-su)
take proper shape; become fully formed
Used when something develops into a coherent, functional whole, often after initial incompleteness. Common in negative contexts (体を成していない) to mean 'it's a mess' or 'it doesn't hold together'.
彼の説明は支離滅裂で、まったく体を成していなかった。
His explanation was incoherent and didn't make any sense at all.
この
This plan hasn't taken proper shape yet, so we need to flesh it out a bit more.