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Account that is debited and account that is credited
Strictly speaking the terms arise from double entry book keeping terminology, and don't exactly relate to their common English usage, which is part of the confusion. All double entry book keeping operations consist of a (debit, credit) tuple performed on two different books (ledgers).  The actual arithmetic operation performed by a debit or a credit depends on the book keeping classification of the ledger it is performed on. Liability accounts behave the way you would expect - a debit is subtraction, and a credit is addition. Asset accounts are the other way around, a debit is an addition, and a credit is a subtraction.  The confusion when dealing with banks, partly comes from this classification, since while your deposit account is your asset, it is the bank's liability. So when you deposit 100 cash at the bank, it will perform the operation (debit cash account (an asset), credit deposit account). Each ledger account will have 100 added to it. Similarly when you withdraw cash, the operation is (credit cash, debit deposit). However the operation that your accountant will perform on your own books, is the opposite, since the cash was your asset, and now the deposit account is. For those studying math, it may also help to know that double entry book keeping is one of the earliest known examples of a single error detection/correction algorithm.