[ Brown + bill cutting tool. ] A bill or halberd of the 16th and 17th centuries. See 4th Bill. [ 1913 Webster ]

Many time, but for a sallet, my brainpan had been cleft with a brown bill. Shak. [ 1913 Webster ]

☞ The black, or as it is sometimes called, the brown bill, was a kind of halberd, the cutting part hooked like a woodman's bill, from the back of which projected a spike, and another from the head. Grose. [ 1913 Webster ]