accumulate
verbUK /əˈkjuːmjəleɪt/
US /əˈkjuːmjəleɪt/
To collect or gather more and more of something over time.
Dust can accumulate on the shelves if you don't clean them.
RELATED WORDS
OTHER MEANINGS
2. To increase in amount, number, or degree gradually.
Interest will accumulate on the savings account each month.
3. To become covered or filled with something over time.
Snow accumulated on the roof during the storm.
4. To earn or gain something, such as points or wealth, over a period.
She accumulated enough frequent flyer miles for a free trip.