1) Accrue 2) Amass 3) Assemble 4) Be credited with 5) Build up 6) Collect 7) Collect or gather 8) Compile 9) Ensue 10) Gather 11) Gather together 12) Get or gather together 13) Go to 14) Grow 15) Hive away 16) Hoard 17) Increase 18) Lay in 19) Mount up 20) Pile up 21) Put in 22) Roll up 23) Salt away Found on https://www.crosswordclues.com/clue/accumulate
• (v. t.) To heap up in a mass; to pile up; to collect or bring together; to amass; as, to accumulate a sum of money. • (v. i.) To grow or increase in quantity or number; to increase greatly. • (a.) Collected; accumulated. Found on http://thinkexist.com/dictionary/meaning/accumulate/
[Verb] To build or mount up. Example: The student's debts accumulated during his three years at university as he had to pay for course materials.
Found on http://www.bbc.co.uk/skillswise/glossary/
Ac·cu'mu·late (ăk*kū'mu*lāt) intransitive verb To grow or increase in quantity or number; to increase greatly. « Ill fares the land, to hastening ills a prey, Where wealth accumulates , and men decay. Goldsmith. » Found on http://www.encyclo.co.uk/webster/A/16
Ac·cu'mu·late (-lat) adjective [ Latin accumulatus , past participle of accumulare .] Collected; accumulated. Bacon. Found on http://www.encyclo.co.uk/webster/A/16
Ac·cu'mu·late transitive verb [ imperfect & past participle Accumulated ; present participle & verbal noun Accumulating .] [ Latin accumulatus , past participle of accumulare ; ad + cumulare to heap. See Found on http://www.encyclo.co.uk/webster/A/16