The Collaborative International Dictionary of English v.0.48:

Broach \Broach\, v. t. [imp. & p. p. Broached; p. pr. & vb. n.
   Broaching.] [F. brocher, fr. broche. See Broach, n.]
   1. To spit; to pierce as with a spit.
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            I'll broach the tadpole on my rapier's point.
                                                  --Shak.
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   2. To tap; to pierce, as a cask, in order to draw the liquor.
      Hence: To let out; to shed, as blood.
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            Whereat with blade, with bloody blameful blade,
            He bravely broached his boiling bloody breast.
                                                  --Shak.
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   3. To open for the first time, as stores.
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            You shall want neither weapons, victuals, nor aid; I
            will open the old armories, I will broach my store,
            and will bring forth my stores.       --Knolles.
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   4. To make public; to utter; to publish first; to put forth;
      to introduce as a topic of conversation.
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            Those very opinions themselves had broached.
                                                  --Swift.
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   5. To cause to begin or break out. [Obs.] --Shak.
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   6. (Masonry) To shape roughly, as a block of stone, by
      chiseling with a coarse tool. [Scot. & North of Eng.]
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   7. To enlarge or dress (a hole), by using a broach.
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   To broach to (Naut.), to incline suddenly to windward, so
      as to lay the sails aback, and expose the vessel to the
      danger of oversetting.
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WordNet (r) 3.0 (2006):

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