noun
a written record of one's personal finances, typically detailing income, expenses, and savings
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She diligently kept track of her expenses in her money diary to ensure she was staying within budget.
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I started a money diary to see where all my cash was going, turns out I spend way too much on coffee.
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I'm broke this month, I need to start a money diary to figure out where all my money is disappearing to.
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Her money diary was like a window into her spending habits, revealing patterns and areas where she could cut back.