Bank2  —n. 1 establishment for depositing, withdrawing, and borrowing money. 2 kitty in some gambling games. 3 storage place (blood bank). —v. 1 deposit (money etc.) In a bank. 2 (often foll. By at, with) keep money (at a bank).  bank on colloq. Rely on (i'm banking on you). [french banque or italian banca: related to *bank1]