This term applies to the new growth of leaves and buds of the tea plant. There are usually 3 flushes on the average- some temperate regions with their year round hot weather can produce up to 10 flushes.
Typically, this is a condition whereby a dry solid material behaves as a "fluid," usually because the material is aerated. Such a condition may cause the material to pass uncontrollably through a metering mechanism (and/or its supply hopper).