Intially the word "fallow" referred to "the fallow system of farming, a practice dating from ancient times. Basically, the term fallow refers to land that is plowed and tilled but left unseeded during a growing season."
However in modern times it's been used by many creative people to refer to a time away from their business or project to work on other things or to rest and recover. A business is generally closed or wound down to very minor work during a fallow period to allow the creative time to be reinspired or work on a different project or body of work that resonates more with them at the time.
Fallow periods generally last a minimum of 12 months and can be as long as 20 years.
In this age of digital disruption and imagination society is more allowing of a person having many roles and experiences in the commercial world
A 'fallow period' is a great way to say I'm not closing the business, I'm just having some time out from it.