bolting, n.
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A sifting, as of flour or meal. [1913 Webster]
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A private arguing of cases for practice by students, as in the Inns of Court. [1913 Webster]
Bolting cloth, wire, hair, silk, or other sieve cloth of different degrees of fineness; -- used by millers for sifting flour. McElrath. -- Bolting hutch, a bin or tub for the bolted flour or meal; (fig.) a receptacle.