Sentence:  He flung his dime at a newsboy, got his "Express", propped his back against the truck, and was at once rapt in the account of his <WSD>Waterloo</WSD>, as expanded by the ingenious press. 
Meaning of the word marked with <WSD> tags:  "Often in the term" '''(meet one's Waterloo)''': a notable and decisive defeat following an encounter with a powerful opponent or a problem that is too difficult.