Sentence:  He was in love with a girl, whose full name he did not tell me, and whom he had not seen for two years. She was a Lady Diana Someone, so much I knew, very lovely, a sort of relation, and he believed he had a chance if only the doctors could do something to help his asthma. “Can′t ask a girl to marry a <WSD>crock</WSD>.” 
Meaning of the word marked with <WSD> tags:  A person who is physically limited by age, illness or injury.