Sentence:  Hundreds of thousands of people were briskly walking in thousands of different directions, all with a common purpose — to visit a cafe or <WSD>sandwich bar</WSD> to buy lunch, which they would eat out or whisk back to their desks and devour during the continuation of their work. 
Meaning of the word marked with <WSD> tags:  A restaurant or takeaway food shop that primarily sells sandwiches.