The verb accumulate has 2 senses (first 2 from tagged texts)
1. (4) roll up, collect, accumulate, pile up, amass, compile, hoard -- (get or gather together; "I am accumulating evidence for the man's unfaithfulness to his wife"; "She is amassing a lot of data for her thesis"; "She rolled up a small fortune")
2. (4) accumulate, cumulate, conglomerate, pile up, gather, amass -- (collect or gather; "Journals are accumulating in my office"; "The work keeps piling up")