Sentence:  The gunfire , which was so near that it seemed just a piece up the road now , stopped for long enough to count to twenty ; and in that brief interval , a redcoat officer came tearing down the road , whipping his horse <WSD>fit</WSD> to kill . 
Meaning of the word marked with <WSD> tags:  (usually followed by `to' or `for') on the point of or strongly disposed