The Collaborative International Dictionary of English v.0.48:

Bolt \Bolt\, v. t. [imp. & p. p. Bolted; p. pr. & vb. n.
   Bolting.] [OE. bolten, boulten, OF. buleter, F. bluter, fr.
   Ll. buletare, buratare, cf. F. bure coarse woolen stuff; fr.
   L. burrus red. See Borrel, and cf. Bultel.]
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   1. To sift or separate the coarser from the finer particles
      of, as bran from flour, by means of a bolter; to separate,
      assort, refine, or purify by other means.
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            He now had bolted all the flour.      --Spenser.
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            Ill schooled in bolted language.      --Shak.
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   2. To separate, as if by sifting or bolting; -- with out.
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            Time and nature will bolt out the truth of things.
                                                  --L'Estrange.
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   3. (Law) To discuss or argue privately, and for practice, as
      cases at law. --Jacob.
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   To bolt to the bran, to examine thoroughly, so as to
      separate or discover everything important. --Chaucer.
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            This bolts the matter fairly to the bran. --Harte.
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            The report of the committee was examined and sifted
            and bolted to the bran.               --Burke.
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