When you accumulate things or when they accumulate, they collect or are gathered over a period of time.
近义词
build up , gather , amass
双语例句
例： Lead can accumulate in the body until toxic levels are reached.
铅可以在体内积聚直至造成铅中毒。
例： Households accumulate wealth across a broad spectrum of assets.
家庭以各种各样的资产形式积累财富。