Sentence:  To <WSD>sugar</WSD> off, I prefer using a kettle that will hold about half a. barrel; and boil over a brisk, steady fire, till on dropping some of the syrup into cold water it will break like glass, then dip it into wooden trays to cool, and when it is grained stir it briskly. 
Meaning of the word marked with <WSD> tags:  In making maple sugar, to complete the process of boiling down the syrup till it is thick enough to crystallize; to approach or reach the state of granulation; with the preposition "off".