This refers to the machine used for cash transactions in stores. It's commonly found at the checkout counter where customers pay for their purchases.
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I took out my wallet at the cash register.
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I didn't have enough cash at the register.
checkout (counter); cashier
This refers to the place where a customer completes their purchase and where the cashier assists in processing payments.
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I made my payment to the cashier at the checkout.
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I lined up at the counter to buy tickets.
Generated collocations (experimental)
to operate the cash registerto pay at the checkoutcashierto line up in front of the checkoutself-checkoutwaiting at the checkoutshopping bagcheckout paymentcash register (in a retail setting)morning checkout duties