From ACT Wiki
1. Sales - reservation - noun.
A sum of money paid by a buyer as part of the sale price of something in order to reserve it.
The deposit may or may not be returned if the sale is not completed.
2. Security - noun.
A refundable amount paid as security, for example by a tenant in relation to a lease.
3. Risk management - noun.
A sum of money lent to or placed with a financial organisation, such as a bank, for a set period or an indeterminate period for safekeeping or to earn interest or as a security to cover potential trading losses.
To place money into a bank account, or to place any valuable item for safekeeping.