WordWeb Online

1. Get or gather together (a large number of something)
   "I am accumulating evidence for the man's unfaithfulness to his wife";
   - roll up, collect, pile up, amass, compile, hoard
    
2. Collect in one place, esp. growing to a large number or quantity
   "Journals are accumulating in my office";
   - cumulate, conglomerate, pile up, gather, amass

Derived forms: accumulated, accumulates, accumulating

Type of: hive away, increase, lay in, put in, salt away, stack away, stash away, store

Encyclopedia: Accumulate