The Collaborative International Dictionary of English v.0.48:

Abroach \A*broach"\, v. t. [OE. abrochen, OF. abrochier. See
   Broach.]
   To set abroach; to let out, as liquor; to broach; to tap.
   [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Abroach \A*broach"\, adv. [Pref. a- + broach.]
   1. Broached; in a condition for letting out or yielding
      liquor, as a cask which is tapped.
      [1913 Webster]

            Hogsheads of ale were set abroach.    --Sir W.
                                                  Scott.
      [1913 Webster]

   2. Hence: In a state to be diffused or propagated; afoot;
      astir. "Mischiefs that I set abroach." --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

abroach
    adj 1: of a cask or barrel; "the cask was set abroach" [syn:
           abroach, broached]