Meaning of “accumulate” - Learner’s Dictionary

accumulate

verb [ I, T ] us uk /əˈkjuːmjəleɪt/

to increase in amount over a period of time, or to make something increase over a period of time:

The chemicals accumulate in your body.
to accumulate wealth/debts
accumulation noun [ U ] us uk /əˌkjuːmjəˈleɪʃən/

(Definition of “accumulate” from the Cambridge Learner’s Dictionary © Cambridge University Press)