Sentence:  But my lord was angry, and being disguised with liquor too, he would not let him go till they played more; and play they did, and the luck still went the same way; and my lord grew fierce over it, and cursed and drank, and that did not <WSD>mend</WSD> his luck you may be sure ... 
Meaning of the word marked with <WSD> tags:  To help, to advance, to further; to add to.