1. (verb)accumulate, cumulate, conglomerate, pile up, gather, amass collect or gather "Journals are accumulating in my office"; "The work keeps piling up"
2. (verb)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"
Definition of 'amass' 
