the world > action or operation > undertaking > preparation > prepare or get ready [verb (intransitive)] > be in preparation (3)
intransitive. To be in preparation; to be in process of mixing, concocting, production, etc.: cf. 4. (The modern to be brewing, partly derived from…
to be making. Now archaic and regional.
intransitive. Of a plan, plot, etc.: to come or be brought into being or to full development. Chiefly in to be (a) hatching.