in the making
In development; in the process of being made or evolving.
You're witnessing a great reference work in the making.
making
UK /ˈmeɪkɪŋ/ US /ˈmeɪkɪŋ/
noun 2
Definitions
noun
1
The act of forming, causing, or constituting; workmanship; construction.
2
Process of growth or development.
As a child, he didn’t seem like a genius in the making.
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