Sentence:  At twilight in the summer...the mice come out. They...eat the luncheon crumbs. Mr. Checkly, for instance, always brought his <WSD>dinner</WSD> in a paper parcel in his coat-tail pocket, and ate it when so disposed, sprinkling crumbs lavishly...on the floor. 
Meaning of the word marked with <WSD> tags:  A midday meal (in a context in which the evening meal is called supper or tea).