Wèile bìmiǎn chāozhī, wǒ zuò le xiángxì de yùsuàn.
To avoid overspending, I made a detailed budget.
Tips
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超 'exceed/over' + 支 'expend/pay out' — literally 'over-expend'. Used in budgets, household finance, and projects. Antonym: 节余 (jiéyú, save up surplus).