Bolting

n.
  1. A sifting, as of flour or meal.
  2. (Law) A private arguing of cases for practice by students, as in the Inns of Court.
    3. Bolting cloth ,
    wire, hair, silk, or other sieve cloth of different degrees of fineness; -- used by millers for sifting flour.
    Bolting hutch ,
    a bin or tub for the bolted flour or meal