accumulate

To heap up in a mass; to pile up; to collect or bring together (either literally or figuratively), often gradually and without active intent.

He wishes to accumulate a sum of money.

To gradually grow or increase in quantity or number.

With her company going bankrupt, her divorce, and a gambling habit, debts started to accumulate so she had to sell her house.

Ill fares the land, to hastening ills a prey, / Where wealth accumulates, and men decay.

To take a higher degree at the same time with a lower degree, or at a shorter interval than usual.

Collected; accumulated.