taまるmaru
1.

To remain in a state where something is not processed or utilized, resulting in an accumulation of items or problems that build up over time.

2.

To be in a location where liquids, such as rainwater, do not flow away but instead gather or pool.

3.

To increase in quantity as things come together, leading to a significant buildup, whether it be dust, debts, or workload.

4.

To experience a rise in savings or financial resources, indicating that money has been added and is growing over a period.

Example:

彼女の目に涙がたまった。