cash register, register (noun)
a cashbox with an adding machine to register transactions; used in shops to add up the bill
cash register (Noun)
A machine that tabulates the amount of sales transactions, makes a permanent and cumulative record of them, and has a drawer in which cash can be kept.
A cash register also referred to as till is a mechanical or electronic device for calculating and recording sales transactions, and an attached drawer for storing cash. The cash register also usually prints a receipt for the customer. In most cases the drawer can be opened only after a sale, except when using special keys, which generally only the owner have. This reduces the risk of employees stealing from the shop owner by pocketing the money without recording a sale, when a customer does not need a receipt but has to be given change. In fact, cash registers were invented for the purpose of eliminating employee theft or embezzlement; the original name was Incorruptible Cashier. It has also been suggested that odd pricing came about because by charging odd amounts like 49 or 99 cents, the cashier very probably had to open the till for the penny change and thus announce the sale.