1
general::
Phrase(s): in the making
in development; in the process of developing. • This is a real problem in the making. Let’s try to keep it from getting any worse.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
In the process of developing or growing, being made, as in The editor believed this election signified history in the making. This term is frequently used to describe the course of events, as in the example. [Mid-1600s]
American Heritage Idioms