1. To become smaller in terms of the number, level, or amount of something; of a battery, to lose its charge or have no charge. English = decrease, reduce, lessen, go flat, (be) flat.
2. To move something so that it is in a lower position; to be in a lower position. English = lower; (be) lowered.
3. Of money put aside in a bank or building society, to decrease or become smaller; to decrease savings; to deplete money.
4. To decrease in value over time. English = depreciate.