bank 2 
(băngk)
(băngk)n.
1.
a. A business establishment in which money is kept for saving or commercial purposes or is invested, supplied for loans, or exchanged.
b. The offices or building in which such an establishment is located.
2. Games
a. The funds of a gambling establishment.
b. The funds held by a dealer or banker in certain games, especially gambling games.
c. The reserve pieces, cards, chips, or play money in some games, such as poker, from which the players may draw.
3.
a. A supply or stock for future or emergency use: a grain bank.
b. Medicine A supply of human fluids or tissues, such as blood, sperm, or skin, that is stored in a facility for future use.
4. A place of safekeeping or storage: a computer's memory bank.
v. banked, bank·ing, banks
v.tr.
1. To deposit in a bank.
2. To store for future use.
v.intr.
Phrasal Verb: 1. To transact business with a bank or maintain a bank account.
2. To operate a bank.
bank on
To have confidence in; rely on.
[Middle English banke, from French banque, from Old Italian banca, bench, moneychanger's table, from Old High German banc.]