A book containing blank checks that a person can write to pay money from their bank account; a personal banking record book.
From 'check' (a written order to a bank, from Persian 'chekk') combined with 'book'. Originated in medieval banking systems and became standard with modern banking in the 19th century.
Before digital banking, your chequebook was basically your wallet—people could literally see how much you spent by counting the stubs, so some folks kept them very private!
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